starter differences manual/auto

ve had my race car parked awhile so this is kind of fuzzy now. I am thinking all of these starters are actually for an automatic. Napa just sold me this one today but now I am thinking the manual had a deeper nose cone . Any definitive advice on what the differences are? Am I right? Napa mispackaged?
http://i1225.photobucket.com/albums/...1945353474.jpg

Ok so I did find an old auto starter and the main difference is the manual has about a 3/8" longer stroke. It looks like my starter plate is the problem the holes are to sloppy.