For anyone who may need to know for the future Part number: No significant difference in length, just the angle at the tips Na's will flow significantly more by the looks: Please excuse the blurry image but the na squirters outlet is significantly bigger So they are not a drop in fit, but this is what i have done to make them work: My opinion if you use je pistons. Either get them machined to accommodate before you do the balancing process or like me use the na squirters as the angle and flow is better, rotate them and make a washer to clamp them down well. Will be working on it tomorrow making the washers and finishing my bottom end so i will update again with photos once its done.