If I'm not mistaken, Group 35 and Group 85 batteries will fit just fine. The Group 35 is a bit taller, but should still fit and will provide a bit more reserve capacity. The Group 85 will fit better but has less reserve capacity.
I can't remember what I got, but I most likely got the Group 35 for the slightly higher reserve capacity. Here are the different sizes in mm, LxWxH. I got mine from Autozone.
231 x 171 x 201
230 x 175 x 225
230 x 173 x 203