We are looking for the CHAMPION SPARK PLUG RB75N and RB77WPCC. I would also like to know whether I can use the RB75N instead of RB77WPCC or not for the Gas Engine Machine? My customer asked me whether he can use RB75N instead of RB77WPCC because the head of the DART design is slightly different. The RB77WPCC has like some kind of Trigger while the RB75N doesn't. Please quote me the best price for those 2 items because I'd like to order 70PCS/3Months repeatedly. Thank you!