Radius rod ball cap??????????

Putting together a Tardel style 32' wishbone with rear radius rods and model a wishbone end. I have a 32' K member that has been wittled down and sits in the model a frame. Just like the book says to do. Now I need a ball cap. I can't find anyone that sells a 32' radius rod ball cap. Just model a stuff. Tardel sells a ball kit on his web site, but I don't know if this will work. Looks like what I need. Anyone of you run into this?

 

http://macsautoparts.com/search.asp?sb=0&ls=y&camid=F30&year=0&make=&ss=rubber+ball&x=20&y=13

 

1928-1940 Ford are the same, I believe. The 41-48s are slightly larger, and the Mercury is even larger than that, I believe.

 

28-40 Ford and Merc are the same size.
41-48 Ford & Merc are larger and the same.

 

Not the rubber ball, but the cap that bolts to the underside of the ball to the K member. Is this the same from 28-40?

 

I don't know if they are reproduced, pick them up at swaps once in a while. I probably have some.

 

I found this one but I think it's smaller than 32"