4" wide piece of leather from the local saddle shop in 1979. Cost $20. He punched the holes for free. Works on any Stratocaster shaped object. No adjustment needed. I got one for SSO and one for SG/EDS-1275/Destroyer all with Straplocks.
There is s guy on E-Bay who will sell you a piece of leather cheap and cut the holes wherever you want them...

There is s guy on E-Bay who will sell you a piece of leather cheap and cut the holes wherever you want them...




