That is interesting. I'm thinking that since they installed the stops, they would have researched how long they needed to be for stock, original steering arms. If you have aftermarket steering arms, they may be different than original too.
I finally looked at my car and I retained the original lower A arms, as they don't really help with the geometry issue these cars had. That is all accomplished with just the uppers.
It has been 7 years since I did the subframe forward restoration and had forgotten I kept the lowers... I need to get this car done...