If you wanted an SAS to be as "stock" as possible you'd want a Early bronco D44 and it's 2 link setup. This is the easiest way to do the swap, it's a little more expensive than the wagoneer swap but once you did it it would be cheap to maintain. I was doing this setup but then changed my mind in favor of using montero 2 link with waggy D44 (having an axle pile is not as cool as it sounds).

LR, yeah LT's is a budget SAS I think he's less than $200 into it ($150 being the D44) and all steel but the rear perches has been scrap metal. I'm gonna run Gen 2 two link up front on mine. <img src="/forums/images/graemlins/kewl.gif" alt="" />
and Angelo if someone were to produce a SAS kit it could fit '83-'00 Monteros easily.