the wood kit has 6 pieces. The 1X1 fits across the seat riser side to side. The 2 curved pieces are used to back up the door panel dove tails. The last 3 pieces are the same, have a taper at one end. These help support the back of the tub. R un from near the top of the tub (taper side against inside of tub) down to the seat riser, bolts to back of seat riser.
You have to drill the holes in all the wood pieces. Hope this helps.