The Bosch SIDI system used on 2013 - later LGE family engines has two seals on each injector tip. These seals must be installed into their grooves and then sized to the engineered dimension before the injectors are installed into their bores in the cylinder head. There are two seal installation pilots included in AAM-GM-51105 (one for each groove) which allow the seal to slide onto the injector tip without catching on any machined surface, welded tip end, or the incorrect groove. GM-51105 enables the use of a seal pusher to drive the seal over the pilot and into the groove, and a sizer to compress each seal into its groove and ensure its size prior to installation. The seal pusher and sizer from GM-49245 must be used to install the seals correctly and to ensure they are sized correctly for leak-free operation.