the ute already had holes drilled in the along the side and on the tailgate for hooks to tie down the toneau and as the hooks came with the car out came the rivett gun and bingo it's on with the hooks !! but they look shite ! so it's drill out the rivetts and fill in the holes .. this is what i'm wondering ? whats the best method to filling in the holes bog or lead or ? what have you guys had the most lasting success with ?