My 1973 is missing the strap I got one this last weekend frome Bruce, I don't think its the right one.
I can't see how it attaches is it possible it never came with one?

There are 3 diff straps. Fuel tank thru early 74, rear engine bay wall late 74 thru 75, and a 76 strap mounted to the battery tray. Search for the thread on this from a few years ago.