massive mods, they have on their site, also email mark tell him you need c clips he will email you back with what you need to do. that's what I did. was here in 5-7 days. I have been looking and waiting since January to buy these items here in the states. no luck. haven't even heard a peep out of russ jones our U.S. rep. All worried about doing the eb mods engines, what about the regular costumer that needs parts? like I stated in another post when it comes to buying anything to do with go engines it is massive mods all the way. they know how to take care of business.