I don't know that they use and off the rack color. I would try asking around military supply stores (it's a long shot but a lot of those guys are vets or military enthusiasts with all kinds of info). What also might work out well is toyota puts out sort of a gold paint, my old tacoma was that color, take that and mix in something a little flatter like an off white...obviously test spray this mix on somthing to see if you like it but that's one way to go. Good luck and I hope it works out for you.
On a side note I noticed from another post you were over in the east bay. I live in the north bay and for the life of me I have not been able to find a local 4x4 group that hasn't gone belly. Do you know of any?
Edit: I feel kind of foolish...there is a group on here specifically for bay area IH and I just posted in it.