Both of my shocks are springlift brand SL 34 60. They are all over ebay or the the interwebs, and probably at the local napa.
The center of the bottom bracket is 11 1/2 inches from the front edge of the rear motor mount and 1 1/2 inches in from the edge of the stringer.
The motor box brackets are 12 inches from the rear lip of the motor box (take the measurement from the rear straight edge not the curve).
I can't remember if I made the brackets on the motor box but I just bolted it straight through with the nut for the lift stud on the bottom. I should of gone stainless on the nut because it is rusting a bit after 6 years. A touch of paint will fix it but you can't really see it when in the boat.
Keep in mind these measurements may need to very slightly from yours depending on where you bolt down the rear motor box hinge. My motor box front edge almost touches the ski pylon.