A range of TE Connectivity accessories for the AMPMODU IV series connectors., 509-2076 Keying Plug with 0.76 mm [0.03 in.] long peg for use with Mod IV housings see 718-9359 typical. 788-0946 Keying Plug with 1.78 mm [0.07 in.] long peg for use with Mod I