Thanks, 'preciate the info. I've already ordered and rec'd. the CMC pieces, $25 for the top and $18.50 for the bottom. My 115 has the 3 1/2" on all four, with more threads showing on the bottom so they may work with the plate. The top has only 1 or 2 threads showing thru the nut, so I bought 2ea 4" stainless bolts for there. I also have the nuts, washers, etc. in stainless, and may go ahead and get 2 more 4" for the bottom holes.
I'm also wondering if I should pull the motor off the transom to make sure I get the holes sealed up properly, even though I'm going to be replacing the floor, (maybe stringers), and transom in the next year or two. Would resin, 4200/5200, or what be best for sealing?