http://www.stkusa.com/lineabedmat.cfm

Something like this should only run about 60 bucks. $288 is WAY too much money for a simple piece of rubber. Just pull up generic bed mat on Google and start from there. You can measure your inner fenders and their relative positions to headboard and tailgate and call the mfg and see what's closest. I do know that the 73-87 metal beds are used by the 60-66 guys as an alternative to the wood floor. And "they say" that the fir perfectly. so that may be a place to start.