Similar idea, I also bought a spare seat off here. Got a 16 can soft cooler that has a rigid plastic liner and shoulder strap for less than $15. Melted a very thin hole through the plastic liner and outer fabric of the cooler using a piece of an old steel ruler at bottom that would accomodate the strap. Took the shoulder strap off and cut it up to make the hold down. Bolted the cooler down using the strap in the same place the passenger hold used to be bolted down. The strap that came with the cooler was nylon and you can just double it over, melt a hole through both thicknesses and attach with a fender washer and the stock nut.
You end up with a very secure tailpack that goes off and on in a hurry without maring the tail plastic paint and you can do it without damaging the seat . . . too bad I didn't think about it before I bought a spare.
Last edited by swjohnsey; 10-13-2005 at 07:11 AM.