You used to be able to get them from Honda- worth trying Dave Silvers. If not I'd go to a model shop and get some drills- an 85 is .85mm diameter, and do them by hand, starting with an .80. Be careful and take your time.
That Sirius kit is $44, plus $20 shipping, plus by my recent experience with UPS there will be about 10% duty and 20% vat on that total $64, plus a further £12 collection fee minimum (and another £15 if you can't get to the depot in the week). So some caution is needed before buying from the US. Try a web search to see if you can get them from Japan too.