After squeezing four AN470 4-4 rivets, because thats all I had left, I realized I had to use the extra 100 4-5's I had left from the front seatback. Wrong! It started to bend in the hole so I used a dremmel to cut some off and then finished squeezing. So I had to grind a 1/16" off the other 96 rivets. I just waited a week for the missing top web and I didn't want to wait for rivets from Vans. I wonder if they would charge me for those cause I should have counted ALL the rivets during my inventory? I finished riveting and it's off to get powdercoated.