Contact Metco,
They made a set for me like the ones at:
http://www.metco-inc.com/caupper.htm
The difference is he made both ends with the large blocks you see in the pic at their site. We had to fit them a bit but they finally went in nicely. You may find another company but I just happened to find Metco.
I'm very pleased with them. Lowers were not changed.
Roscoe