i bought a set off of ebay. One would not close, so I cleaned the old one and stuck it back in. The other is arcing out against the ponts cover, so I have to clean that old one up and put it back in. Basically, be careful about who you buy from. Sadly I had left my response before I got them in so could not warn others.
1973 CB350G or K5
1983 GPZ750