I counted five hundred of each size rivets in my savannah kit and weighed the balance. It was the only way to finally prove ICP were being tight with the rivets. turns out there were plenty of rivets for a standard build but the extra fuel tanks, baggage compartment extension, rudder extension and so on were putting strain on the supply, so every builder was coming up short. Depending on how many factory options added the problem just got worse. The distributor supplied the extras needed and all was good.