Mar-K dosn't make side trim. Not that I could find anyway. The truck and car shop had side molding kits also. $319 for the short bed and $329 for the long bed, that includes clips also.
http://www.truckandcarshop.com/trucks60_72/t60_059.html .. A little bit more at LMC truck.
http://www.lmctruck.com/icatalog/cbe/full.aspx?Page=19