I looked at mine and it is really close in there. I would pull the bolts, put the spacers over the bolts and see if they will thread up (taking care not to cross-thread). Also be careful when tightening, making sure it doesn't bind up too much.
Also, my plate has the dog ear taken out of it (as in mgs96ps's photos). I wonder why your plate is different.
'96 ProStar 205 SD LT-1