A500 beef up parts

Looking for billet servos and accumulator preferably with double sealing rings, and heavy duty bands. Possibly a 3.8-4.2 KD lever (don't know what ratio I have in there at present, I don't have it open yet)
Looking for sonnax, superior type parts.
Also the heavy duty adjuster wedge and strut for the front band and any/all snap rings as would be in a 904/a500.
Whatcha got collecting dust?

Not gonna be a race trans, retrofitting into a truck. Just to clarify what kind of "heavy duty" I'm after.