TIME TO CLEAN OUT THE STORAGE UNIT. I HAVE SEVERAL 17",18",AND 20" INCH TIRES TO SELL. THE SL D/C MEANS SLIGHT DRY CRACKED. THE SCREW NEEDS PLUG MEANS THAT THE TIRE HAS A SMALL SCREW IN IT AND NEEDS A PLUG OR PATCH. THE ID CODE D2 ETC. HELPS ME TO GET YOU THE CORRECT EXACT TIRE CALL TOM (NO TEXT) 314 808 334EIGHT