Called Lord for part no for my rv-6, 0-320b3b conical mount and was given two numbers J-1552 and J-6230-1 which is a kit. I The rep said for me to use the kit my engine case would need pins next to the mounting bosses. My case doesn't have any pins there that I can see. Does this mean I have to use the 1552 isolators? I think the rep said the kit was an improvement. And if I have to use the 1552 does anyone have a good (cheapest) source for them? And is this isolator an improvement over what is sold at Van's? Thanks in advance Jim.