How can you tell what model your bike is

Ok. I'm rebuilding the engine on this bike I just bought, which is a 1993 GSXR 750w. I go to sites like Babbit's Online, Bike Bandit, etc. and can find the parts. But when I go to get the parts I need, some say Model P and some say Model R/S. How can I tell which part I need for my bike. Is it marked on the engine in some way, or on the bike.

I was told to look at the VIN number, but all I can see is numbers and letters. Nothing special about model and such.

How to find out the model year of my Suzuki?:
http://www.suzukicycles.org/_misc/identification.shtml

That's not exactly what I'm talking about. For example, on Babbit's Online, they have two version of air Cleaners. They say this:

1. SKU: 13700-17E00
---CLEANER ASSY, AIR MODEL P MODEL P
2. SKU: 13700-17E01
---CLEANER ASSY, AIR MODEL R/S MODEL R/S

How would you be able to tell if your bike is Model P or R/S?

Ohhhhh, I think I see now. The P tells me that the item is for a 93 vehicle and won't work on the 94/95 with is R/S? If so, I'm blind, I just now thought of that :hits self in head: lol