I suggest you post your need in the "Classifieds" forum under a "WTB: 3" Squeezer Yoke" Title. That should get more responses than posting it here in the RV-7/7A Forum. It doesn't matter if it's been used on an RV-7 or -8 or -3 or -4, etc. When you post here, it restricts the number of "hits" on your post.
Just a suggestion.
P.S. to Bob...I sincerely apologize, I see you have already posted this in the "VAF Classified" forum under an appropriate Title.