i think the apple ones are the only drives that are slot load and a slimline case.
i have an apple drive (probably the same that you are looking at) and from what im told, it is compatable with non apple PCs. i havent confirmed this yet with any of my own testing, but they should work... from what everyone else says around here...
post a link the the ebay auction so we can see what you are looking at. most likely all you will need is a 50 pin JAE to 40 IDE adapter.