I have noticed classification of parts stating "E" and then a number, example - E21. I own a 1993 318i convertible, 5 speed. What "E" model is this?

you have an E36.

check out this link for more info:

http://bmwworld.com/repairs/codes/vehicles.htm

Thank You.

New to the site and i realize i could go through 1000 posts looking, but is there a particular website you like that sells new or used parts?

i like BMP Design and Bavarian Auto Sport.

bmpdesign.com
bavauto.com

thanks!!