If you are NOT hard core like some of the folks out there on Gnet the cheapest solution is to install a GRR-5 radio on the Jeep; For transceiver I recommend BC-659 if you wish to model earlier installation or for later in the war installation use a BC-1335; post WW II you can go with RT-77 or GRC-9; please note getting the mount for BC-1335 or GRC-9 can cost some $$$ also, Grr-5 is the chepaest option and Fair Radio has some rusty mounts let; you can sand blast them and paint them as once they are installed they are not showing much meat; For all you can use various length MS antenna section and MP-48 base; for Korean era install the AB-15 base will work too.
I recognize this is neither an official list nor the approved list by some but good enough to pass mustard with most folks. Get a LS-7 speaker for the installation with a CX-1334 cable , typically 2 foot long with a U-77/U on one end and JJ-026 on the other; it will fit into the JJ-055B plug on the LS-7 speakers that usually come with. Another route is to go with H-113 headset which is going to cost you much cheaper, check FAIR RADIO in Ohio;
If the cost is prohibative get a LS-7 speaker then get a LS-454 speaker, you can find them for $30; If you go with transceiver then you need the right mic/speaker combination or handheld telephone type TS-13E - http://phonesurplus.com/handsets.html
, another option is to get LS-7 and T-17 microphone.
I have SEVEN Grr-5 in my collection and you need to ensure the power supply is functional. Typically they suffer from three main issues, the rectifier on the end of the cable is dead or cuts out when it gets hot, the four pin vibrator is gone dead on you (you can check the net on how to revive them) and finally the T102 transformer which after 70 years plus operations gives up and starts to short as the wiring insulation deteriorates.