That’s a steal even if the woofers are not the correct ones and as they are not producing the bass-response these speakers were made to offer. See if the 'new' finds operate at all first. In the past, I've paid more for AR-3a empty cabinets.
Sourcing these woofers might not be that hard as the AR-2ax has the same woofer. Check to see if the
tweeters and
mids are operational also.
If it were me, I’d disable your 2ax’s woofers and tweeters and put them in the 5’s. These will need a fair amount of wattage to sound their best. Also, if the tweeters are blown, use the inexpensive ones suggested on the site I refer to. AR-5's are not that common and deserve all and any efforts you make and they're one of AR's finer models.
The crossover is an easy fix if you are adept to such things.
The AR-5’s will easily sound better than the AR-2a’s due the midrange contained in the 5’s.
I’ve been an AR nut since before 1971 and solely own and operate AR’s in my systems. If you heard my system in person, you'd understand.
Go see the link I've included, it's where I generally reside and ask questions or better yet, do the research there where they speak AR language.
Doing research of the correct posts will be of great importance. Compile your opinions after doing the
proper research is your only real companion.
FM
https://community.classicspeakerpages.net/
Here's a slight sample of LST:
https://community.classicspeakerpages.net/topic/10649-do-ar-speakers-really-sound-that-good-more-new-video/
Below is my ultimate and years in the making system that features dual AR-LST's and 700 watts RMS at 4 ohms per speaker.
View attachment 3748184
FM
53