I dont think theres a DIY...i think MOW is the lowest cost one...but mind you its not as secure as a rig....I may be able to do a DIY sometime for this. I just kinda rigged one up a few weeks ago for my wifes. Maybe on another site...but look up fettdads harness its pretty much the cheapest option...maybe make it yourself. Get some used seatbelt material from a junkyard....make harness