(A) Measure the Diameter of Tubes: 16", 17, 18", or other
(B) Measure distance from Top of Transom to Bottom of board or ruler:

A rod that goes from the dinghy transom up over the top of the tube to the davit head on the swim platform for inflatables with 16-18 inch tubes. Replaces transom RP101 pad.

If you do not know witch one you need you can leave it blank. You will need to fill in the work sheet below to order this product.