Hi @Beardedknob,
I’m a part-time wheeler myself, and had loads of help and comments around all sorts on here, so wishing you a welcome to a wonderful community!
If you do a search on the forum you will find a load of articles and info around this:
https://lovehoneyforum.com/search?q=penis%20extended%20category%3A85
I do not have direct experience of using one (yet, but that may change at some point - I am less than average size, and whilst OH is OK with that its something I might surprise her with sometime in the future as a bit of variety)
From what I remember on the posts I looked at, the LH range seem quite popular with the ball loop. I think they all have details in terms of external size along with canal size (what you go into), as an example:
https://www.lovehoney.co.uk/sex-toys/male-sex-toys/penis-extenders-sleeves/p/lovehoney-mega-mighty-2-extra-inches-penis-extender-with-ball-loop/a42604g76682.html
There are some good threads around impairments where people have shared their experiences, they may also be worth a read through some point and see if anything relates: