Hi Max,
I have had to grind the ends on a few Quatam coils to fit them on various motors. The one interesting one recently,I fitted a Quantam coil to was a 16hp V twin I think it bolted straight on, might have had to grind the ends a bit because of the bigger diameter flywheel, and I had to extend the HT lead but all pretty simple because I wasn't going to spend $60 on a Vanguard coil