The Ivans kit is mainly a tap and appropriate bolts to screw into the spigots once they've been tapped, you shouldn't need to buy that as your mechanic should be able to tap them out for you, provide the bolts as well as source a cap for the carb. The only non standard part is the cap for the airbox, as has been said there are many options, it seems to be a standard size for the plastic caps on small spray bottles so not difficult to find. I also went with the Holeshot kit as it's simpler (I'm not good at tapping) and I think looks neater but it was expensive, took a while to get to me and didn't come with the rubber caps like the Ivan's kit does.