Greetings from Melbourne Australia, I hope the esteemed long-established P-Mount Owners Club is still accepting newbie members, please?
I acquired a Technics SL-7 linear tracking TT a couple of years ago that I run alongside a restored Dual 1219, two rather different era automatics, each with their charms, and each built solidly in very different ways!
The SL-7 came with its original Technics P202C cartridge, but had lost its original stylus with the lovely boron pipe cantilever along the way and had a rather sorry excuse for a cheap generic conical stylus on it.
I had the SL-7 serviced for lubrication, new tonearm drive belt, etc, not long after I bought it. Without the budget for a JICO stylus for the P202, the quickest and cheapest way to get the SL-7 back in service in a reliable T4P spec was the ubiquitous Audio-Technica AT81CP with itys standard conical stylus.
Subsequently I upgraded that AT81 cartridge with a new ATN3472SE elliptical stylus, which I thought a big improvement over the standard conical, but is still somewhat lacking in both sound "body" and finesse compared with the AT-VM95ML that I usually run on the Dual 1219, or the fabulous Micro-Acoustics MA380 that's been on the Dual more recently.
More recently I have bought a couple of other vintage T4P carts and styli to try, some of which are NOS, and one rescue job by Groovetickler of a Pickering TL-3S, although I haven't got around to mounting any of them yet. (I'll post further details of what's sitting on the shelf in a follow-up post.)
My specific questions today are regarding Shure P-mount cartridges and styli suitable for the SL-7.
As a cheaper entry point to the world of Shure P-mounts, I recently bought a cheap used Shure Realistic RXT6 catridge and what seems to be its original stylus, in what appears to be OK condition. And then I realised (after it was paid for and already in the mail to me) that the swing-down stylus guard with the little brush that's on the RXT6 stylus grip seems to make it too wide for the SL-7's tonearm to park properly in its far-right position above the outer track of an LP. Ooops.

OK, lesson learned, avoid Shure P-mount styli with the swing-down stylus guard and brush if installing on an SL-7 or similar.
But then I "got very lucky" and found a NIB/NOS Shure N97LT stylus, which does not have the guard and brush and so is sufficiently narrow to not interfere with the SL-7's tonearm parking. It was a very reasonable price, is in its original box with specs sheet etc, and it really does look unused. Seems to have the telescoped cantilever, too, which I think indicates original US production if I understand various postings from the Shure experts around AK and other fora.

It seems to fit the RXT6 cart well, so I look forward to mounting it and trying it in the next week or so.
My questions to the Shure P-mount experts, please, all in the context of the use case is an SL-7 linear tracker (which can only use T4P):
1. Cart: Is the RXT6 cart a good way to enjoy this N97LT stylus, or would there be any significant benefts from running it on another Shure T4P cart (M96LT etc), an M111 or M110, RXT5, DT25P/35P, Presence 8 or other Shure T4P cart?
(One consideration for me here is perhaps selling the RXT6 intact with its too-wide headshell to someone who can make better use of it on a different turntable.)
There's a lot of forum postings over the years about whether (excluding differences in styli) there were/are any real differences between the various Shure T4P carts (V15LT apart). I'm not sure where the investigations of this by various expert members over the past 2 decades eventually settled... Something about the N97 ERA IV carts being regarded as superior by some members, but not by others?
2. Stylus: Given the rarity of my NOS N97LT stylus, I think I should obtain a back-up for it. What would be a good brushless equivalent Shure T4P stylus for the SL-7? I'm keen to get a hyperelliptical or better such as a nude hyperelliptical or line contact, etc. with similarly high compliance / trackability to the N97LT. From the specs published by Shure, it seems that the N110HE stylus is identical to the N97LT, and with a similarly brushless and narrow grip (unlike the N111HE), so that's one option - correct? Any others that are recommended, or do I need to dig into generic replacements for the N97LT or the N111HE?
I'd be very grateful to benefit from any members with relevent real-world experience, please.
(BTW I still have the Technics P202 cart and just last week I found an unused Goldring EP-202ED elliptical stylus to try on it, but that's another story for another time...)
Cheers and many thanks,
Rob in Melbourne