Take your autocom speakers along and leave them with the chappy from Ultimate ear.....they'll modify the autocom loom so you end up with the grey seven pin round plug/socket afair and a 3mm stereo jack socket hanging off it...you just plug your ultimate ear plugs into the socket and the autocom connection is made as normal.
I had an issue with the time it took them to complete my set but they are top top kit ......literally all-day comfy, great sound quality and i'd buy some more if i lost mine.
HTH