So I have my engine out and Im waiting on my replacement from Rapido. It has been suggested to replace my coupler while its out. I didnt realize something so simple would be so expensive. Do I really need it? Can I tell by looking at it if it is in bad shape? Next Q. The coupler I have is triangle shaped on a 14" flywheel and has a grease zirk on it but no part number. engine is a 87 200hp 305 alpha one I am replacing it with a 350 but should be no difference, it is of the same vintage. The coupler I lloked up is a 18-2175, it says it comes with the new style yoke. if I already have the new style yoke it says to use 18-2323. How do I know if I have the new style yoke? whats the difference?