Answered one of my own questions today. I looked at some seat backrests listed on ebay, one Bison Brown, and one Havana Brown, and there is a clear difference in color. So it looks like I need to find one that is Havana Brown. I also got a quote from the dealer. $788.99 for a new one, not including the passenger back rest, ouch! Looks like I am going to have to find a nice used one.