check redline.com to see who else = carries it in your area. I can't believe a dealer that carries redline could not = get you the knd you want. 75 w 90 is for the front diff on the syncro... = MT90 is for the rear tranny. I don't know if it will matter or not, but I = wouldn't go against the MT90 advise. Redline can be elusive, but it can be found. I had to ship mine into the big island from oahu. = it's worth the effort.