The shop that did mine is long closed. This guy,
http://www.bruneauperformance.ca/ races a 62 409 car, and while some may have a problem with him, you might at least run through his site and see what he has to offer. You could do the same as I did though and have the caps made up locally. I sure wasn't the first one to come up with the solution to the problen, but I sure did break a lot of rear axles and rear main caps before finding the solution. Luckily, I had my problems at the height of the
Junior Stock era, when everyone shared solutions.