I just received the 2006 JP Cycles catalog in the mail so last night I was browsing through it. I was looking at the Progressive 440 shocks for my FLHX and every listing for FLH models say (except FLHX). What's up with that? As I read closer, only the polish aluminum finish said this, there was no note like that for the black ones. Are the dimensions of the polished different than the black ones?