Morris Classic Concepts - Seat Belts

[voxnor]

Seen these guys recommended several times on the board. Going to order through them but was hoping some people on here had some first hand experience with them?

I am 5'8" and just north of 290.. Pretty big around the middle. I can't seem to find measurements on their site - not sure if I need an extender or not? I fit in the stock lap belts prior to their removal, but without much room to spare

Also, for the lap belt in the middle of the bench, they said they only have the 60" belts ( that they label as Rear lap belts) - is that long enough for normal folks to use on the stock bench?