OK, I've been thrown into maintaining my own car. No biggie, but b/c I haven't been doing it I need some help understanding some things. I've had the car a little over a year & have heard these terms but not paid a lot of attention.

I have an '83 240d manual. I'd like to know what years are compatible w/ this for parts.

Also, what do 123 & 124 mean(I think it has something to do w/ body style???)? When I hear 200 series does that mean my car? When you all talk about WW2 cars what years/models do you mean?

Just tryin to get up to speed(no pun intended), so I don't feel so ignert about all this.