[David Pozzi]

I can't find ss101-100 on their site, is that an AFCO part number?
I'm not aware of an arm they make to fit a Camaro.

The balljoint AF20032 I did find but not AF20032-1. AF20032 is a second gen stock balljoint which is 10 deg taper not 7 deg which is what you need.

Generally a late 60's pickup UBJ is used by circle trackers as a tall UBJ. The problem with that is, the bolt pattern is similar to a first gen but it's larger and requires your stock arm to be sectioned and a new balljoint seat welded in. Many of the AFCO upper arms take this larger balljoint so stock balljoints may not bolt in. You need to make sure what size UBJ the arms will take. Also the arms appear to be flat so they may not have the correct angle for the ball joint.
I'd be cautious is what I'm trying to say. Their arms look nice but there can be drawbacks. I don't see any that have enough caster built-in.

If you buy Delrin (Acetal) get the stronger "reinforced" Delrin which has Fiberglass in it. But when you machine it, wear a mask and it'll be itchy to handle the shavings.
David