ricky a cheap, easy (and better looking imho) option is to use epdm silicone caps from vital parts, along with self clamping spring hose clips (in carbon steel black). The fellers on the xjr13 forum (who used to use fazer thou kits) put me on to them. They are heat resistant up to 210 degrees. My fazer is already sorted, but I gotta do the xjr and Dave (Dynspud) will be doing his fazer at the same time. the idea is to use two(4x 12mm inner and 4x15mm over the top) so its belt and braces, held with the spring clip. on the xjr its just a case of putting a bolt in the pipe from the airbox; I think on the fazer you gotta blank a hole off but thats easy done.Im waiting on the inners at the moment as they were out of stock, but got the outers and he clips for mine and daves. bear in mind when ordering they are going by the inner diameter, not the outer, so these in the pic are actually the fifteen mil outers and clip size. you can see what a pain the ais on the xjr is to get the two middle plugs out, especially as there is a flattened trumpet of an air duct over them too that forces air onto the middle two cylinders