rear disc conversion

i remember seeing on strictlyz? or shome? or one of those websites a CNC adapter someone had made which sold for $50, was intended for our 240's and allowed the bolt-on use of 280ZX to '84 300ZX rear calipers and discs. I just spent an hour looking for them and now can't find them.....

I've found adapters for 240SX rear calipers with maxima rotors, i found kits which required an adjustable proportioning valve, but not what i remember seeing on the 'net like 6 months ago....

does anyone know where i can find what i am looking for?

or am i going about it the wrong way and should instead opt for one of the kits i've listed above....

(interestingly none of the kits mention anything about getting the appropriate front to rear proportioning valve off of the car they are getting the calipers from... the last time i did a rear disc conversion (on a Honda mind you) it made a big difference to get the right prop valve as I found there was a difference between cars having rear disc vs rear drum...)

-e