This set of two 1G-3 seats are for use in later versions of the Skyhawk as they include the SEWARS release system on the harness. This set includes the wrinkled parachute pack and if you prefer the tightly packed pack make sure to check out sets 32044 (2) and 32045 (1) respectively. These seats were retrofitted a lot so make sure to check your references and timeframe to make sure you have the right seat(s).