That is a Chevy bolt pattern.
Based on the front bearing, it's a WC version.
26 splines would be either a V8 Camaro, or a WC S10. If a V8 Camaro, first gear would be 2.95. Most WC S10 T5's used a Ford bolt pattern.
The tail housing is for an electric speedo only. When looking into the hole, is there a machined surface?
Identification of T5's is by the paper tag on the top plate, or the metal tag bolted to the tranny. Problem is, both can be inacurate, as top plates and tags can be swapped around. You need to learn what the physical differences are between all of them if you ever want to be certain of what you're buying.
