HI CAN ANYONE HELP , I AM PUTTING A KX500 ENGINE INTO 2003 KX250 STEEL FRAME , I CAN MACHINE CASES DOWN TO FIT SWINGARM , OR MACHINE SWINGARM TO FIT ENGINE CASES OR DO A BIT OF BOTH , I WONDERED WHAT THE BEST OPTION IS ALSO I WANTED TO USE EASILY AVAILABLE SWINGARM BUSHES & BEARINGS IF I MACHINE ARM , MY ENGINE IS A EARLY ONE WITHOUT THE STEEL SPINDLE BUSHES IN CASES BUT I DO HAVE A LATER ONE WITH THE STEEL BUSHES IN CASES SO I HAVE A LOT OF OPTIONS , I JUST DONT WANT TO RUSH INTO A MISTAKE , MANY THANKS