Go to your Local NAPA auto Parts store. They carry screws and bolts and will have harderned hex head cap screws in metric sizes that will fit your carb bowl and slide cover. I got mine there and the total cost for it all was about $6.00.
The sizes you need are 4mm x 10mm, #81661 (Carb Bowl); 5mm x 12mm, #81664 (Slide Cover); and I also got several 4mm x 25mm, #82057, standard pan head phillips screws, for the carb to intake boot. It's a time and headache saving resolution to your problem.
As often as you are likely to be messing with your carb to get it right, it was the best money I spent...CHEAP ASS JAPANESE SCREWS!
Dump your airbox altogether, get a $45.00 Dynojet kit, a $42.00 Slip-on K&N filter, and a $3.00 #50 pilot jet;;;;;AND SHIFT AT 8000rpm!!! It hauls butt this way...10 times better than it did with the best airbox set-up I found, and it is way easier to service.
When the Vortex CDI box is available in about 2 weeks, I will add that, and get 10 programable power curves, and an adjustable rev limiter for some extra over rev capability. I will then be in Predator Nirvana.