Need help with a GM Catalytic converter

I do not normally deal with these, but had some exhaust work done today and told them I wanted the old cat back. Does anyone know what this would be classified as? From what I can tell it would be large GM but I am not sure. It is off my 95 Chevy Silverado.

https://plus.google.com/photos/11291...KD2rrWUtLuE_QE

5-hole cheese grater- Medium GM. Same style with 4 holes goes as either Large GM or X-Body depending on the numbers.

yeah thats a gm should be anywhere from 80-100 or so