Physical size difference between PT76GTS, On3 7875, VS Racing 88/83
 

I'm picking up a used kit that comes with a PT76GTS with a .81 exhaust housing. I'm using the turbo on a 6.0 LQ4 and would rather opt for the .96 housing if I keep it. I'd also tossed around the idea of selling it in favor of a On3 7875 or VS Racing 88/83. The kit is an old GMR Speed single kit and I'm going to be limited to spacing where the factory alternator normally sits. Does anyone know how much bigger the 88/83 is? I figured the PT76GTS and On3 7875 were very similar.

Why not sell the .81AR turbine housing and buy a bigger turbine housing?

I may, wasn't sure if they were still available from precision