Keyless entry handset is the correct term for what many refer to as a "fob".
Yes, all DIIs were equipped with keyless entry.
Keyless entry is a convenience, but not necessary with a DII. Except, there is a shaft in the driver door mechanism that is prone to breaking, and if it breaks and you don't have keyless entry getting into the truck will be ... difficult.
Fortunately the shaft that is prone to breaking can be replaced fairly easily with an much beefier version that should eliminate that risk.
As for sourcing a replacement keyless handset, it's not that difficult. Two versions were produced. If I recall correctly, the handset and receiver for North America Spec trucks operates and 315 MHz, and all others operate on the 433 MHz frequency. If you have an NAS truck and can confirm the replacement came from an NAS truck (used) or is otherwise confirmed at 315 MHz (new), you should be good to go.
Good to go, that is, except you'll need a device to program the truck's computer to recognize the key. (Its not the keys that programmed, it's the BCU (Body Control Unit). Any shop that works on LRs can do it. A lot of them use an expensive diagnostic tool called and Autologic. They may charge you an hour's labor for a 5-minute job.
In the DIY market, the go-to OBDII tool that will set up keyless entry handsets is the Nanocom. It's a little pricey, but depending on where you are located there may be a forum member nearby with one to help you out.
One other thing -- when buying a keyless entry handset the only thing you need to worry about is the circuit board inside the shell. Shells are often knackered by now but are available on eBay and elsewhere for a few bucks.
I hope that helps. Good luck, and let us know how your purchase turns out. Oh, and welcome to the forum.
