G50 porsche box? 5 or 6 speed?

[marco the T.S.E]

Im in the process of buillding a new floor pan for my bug, as the T1 Erco box(swing axel) that my pan was build around is just not up to the hammering that i give it(to much power for the ring/pinion)!
so im thinking of a G50 box, I have a compleat rear suspention, brakes and axels of a 996(new 911)porsche, that im going to graft into the bug pan.

Im looking for info on the G50 box and different versions and witch cars thay came from.

thanks for any info/ web sites .