Also I believe nylon pads get brittle with age in a hot engine oil environment. There are newer type nylons such as Stanyl 46 or Stanyl Diablo which last longer before getting brittle in engine oil. I asked a couple of companies how much it would cost to make a copy of our pads in one of these newer nylons but their minimum order is something like 10,000 units
Another option could be to have replica pads machined out of a block of one of these new nylons, but machining costs are not cheap either.
If there is a way to repair old tensioner units that would be amazing. Over £1000 for a pair of new units is a bit much.