1938 Packard Model 1607 UltraMat Sound Deadening insulation Deadener Heat Floor Kit , Model 16071938 Packard Model 1607 UltraMat Sound Deadening insulation Deadener Heat Floor Kit The engineering team at Zirgo Sound Labs has specifically designed this kit for your 1938 Packard Model 1607 Inner Floor. This kit includes all the correct material needed to reduce echoes, drones and unwanted rattles resulting in a quieter ride. The exclusive advance design of the open closed cell foam wall helps remove unwanted sounds by absorbing background noise