The original boards have grooves that fit the molded rubber covers( ones sold at Rock Auto Parts)....the smooth boards will require cutting off the molded rubber or you could get some type of flat backed rubber to cover....I replaced mine not knowing about the groove and flat issue( I had the flat boards) and had to make a tool to skim cut the rubber channels off. Tough job ...but came out nice. Sorry , no ideas where to buy boards , but thought you should consider this issue before buying. David