GT28R = gt2560r in the new naming scheme. It is not the same as the gt2860r, that site has bad info. Go to Garrett's site, look at the turbine dimensions, measure the turbine dimensions on your turbo if you are uncertain.

 

I got this exact turbo barely used and dirt cheap. I also got thrown for a loop with the GT2560R on the tag and bought a GT2560R housing that didn't fit — the turbine is a 76 trim. You'll need a 76 trim T25 standard 5-bolt housing, and then you can use it with any T25 manifold and 5-bolt downpipe.

ATP Turbo link

 

When is a GT2560R not a GT2650R?

T25 housing w/standard 5-bolt outlet

inlet detail

inlet/outlet adapters and actuator bracket from ATP Turbo