Two bag kits existed as early as the first 275 GTB/GTS cars. They were developed for the 275, as the cars had "wells' in each corner of the trunk, and the large single bag would not fit into the well, so they split the tools into two bags. However, as is typical of Ferrari, both styles appear somewhat randomly during the time period. Remember, the tools were supplied by outside suppliers. Bids were sent out and whoever won the bid, supplied the toolkits. If the factory ran out of a certain style, they substituted until a new supply arrived.