I picked up a pair of Sparco harnesses because they were a good bargain but soon realized they were for a floor mounted application as opposed to a rear bulk head one. The rear straps are way too long. Anyone ever come up with a way to get these to work, or is it safe to shorten them?
Thanks
Rob

Ideally they should be stitched again but as CaLviNx says you can carefully seal the bare threads with a torch. Your local trimmer should be able to sort it out for you safely.

I shortened a pair of belts satisfactorily.
Cut and sealed the end, as mentioned in the earlier reply, folded the sealed end over and stitched it with a domestic sewing machine easily. The sewing was not load bearing, because the shortening was effected by the buckle system.
I would think twice if the sewing involves a load bearing joint.

HTH

Mal