1998 Chevy Cavalier Car Starter

1998 Chevy Cavalier 4 cyl Automatic

I was calling around to find out prices for a starter for my 1998 chevy cavalier. When calling they asked me what the cage or gage size was on my starter. I'm not sure what they meant. They said there is a 3 1/2 in a 3 7/8 in and all these different sizes. How do I find that out and what is the difference and does it even make a difference. There was different prices for each size.

1998 Chevy, Cavalier 2.2L engine if this helps.