Well they are 35 years old +/- and only around 70k total of them were imported to USA across all model years including Raider and Montero name plates. Not many left on the road, and with that small of a number, aftermarket is very limited unless the part is used across several vehicle models. The same issue with any old low volume vehicle. Sweet spot for aftermarket parts for any vehicle is 15 +/- 5 years, OEM back then was only required to support for 10 years after last MY for body style - so 1991 means 2001 for OEM support. Anything left is just luck.