The control unit you're talking about is NLA for 84-88 vans. 89 vans use a unique controller (non interchangeable) & I just purchased one about a month ago (it was one of only 2 remaining in US inventory). Like Mike said, none of the cables are available here in the US anymore. I'm not sure if these could be special ordered from Japan or not. If your cables are stiff, lubricate them and it will make a HUGE change in performance.

Motorcycle shops sell a special teflon lube for this purpose (comes in a spray can like wd-40). They also sell cable lubrication tools (for injecting the lubricant into the cable), but I've found plastic wrap to work well. Just put the little delivery tube (that comes with the lube) parallel with the inner cable, slide it right up to the outer sheath, then wrap tightly with plastic wrap to seal. Then just put the other end of the tube on the can of lube and spray until the lube starts dripping out from the other end. If you lube them up every couple of years they will never get stiff. Tim