While I don't specs for the 1986/1987 Elite RS, I do for the Lemans RS. It was spec'd with a Tange CrMo fork, though the actual tubeset is not mentioned. Presumibly, the Elite RS and LeMans RS are the same frame with the difference being the components, New 600EX on the former and an L & Z-series mix on the latter.

BTW, the RS designation stands for Road/Sport and refers the intended function of the bicycle, having slightly less aggressive geometry than the Dave Scott Ironman models.