HMMMM
If they are for your boots then I am guessing that they are not "pop" rivets. If they are a plain metal rivet (looks like a capital letter T) then I would place it through the existing hole (so the nice side is exposed) , on the inside I would place a washer over the small end of the rivet then place the rivet (with boot attached) on an anvil and start "peening" over the small end. Basically you have to mash or mushroom the end on the rivet to make it bigger than the hole it just got pushed through. The washer just makes a stronger job of it. :confused: