Fitba101

Hey guys, wanted to pick you brains about a starter question. So I was having some grinding upon start up, so I replaced the starter on my 2008 JK with one from O'reily. Checked compatibility prior to purchase and it's the right one for my JK. It looks identical in size and shape to the old one. Started up great after, very quick, no grinding etc... I did notice however that there is a small gap on the right side of the starter once installed that I don't recall being there before. Not sure is this is an issue because it installed perfectly and I'm assuming when the starter is seated correctly that no water or anything cab go anywhere other than the small open section. Wanted to get any thoughts folks had and see if anyone has had similar experience with a starter replacement.

Any help is much appreciated.