The Denon DL-103 should work well with your Technics, but you are unlikely to find a cartridge of the same quality as the DL-103 for your SL-5. Have a look at P-mount options on websites such as LPGear and Needle Doctor. You could try something like an Ortofon X1-MCP, which is a high output MC.
LPGear has limited stock of the Shure V15V-P, but the problem with them is finding a compatible stylus once the original stylus is worn, and LPGear runs out of original replacement styli. The Shure V15VMR stylus will fit, and is available from Jico in MR or SAS shapes, but isn’t suitable for P-mount turntables like your SL-5, as it’s not the same weight as the original stylus.
Perhaps the best option is an Audio Technica model, as many of their P-mounts can be upgraded with Shibata or microline styli. Something like the AT-311EP can be upgraded with the ATN-3472SA Shibata or the ATN-3472ML microline stylus.
There are also some really excellent Technics cartridges that are P-mount, but the problem is finding them at a reasonable price.