I got my fasteners through the local auto parts store, give them the diameter of the holes and how many you need, there is a few different sizes of fasteners and you would want a tight fit. I think you have color options too, so ask. Mine came in like a box of 25 or something.
JB for making the fasteners stick? I would just go with an RTV sealant, it is cheap, and won't permanently stick them in there.You won't need alot or anything, the fasteners will fit tight, sealant is probably optional.