Kind of boring but it's what I did today in the few mins I had spare.
I am using Toyota Kluger/Camry side indicators as I like the shape. These are sealed, cannot replace the globe, and expensive at $68 (!!!) each. They are formed for a plug-in connector of course, but the pigtail doesn't exist Toyota say they plug straight into the loom and the plug cannot be ordered. I didn't want to scrounge wrecking yards so I added my own tail.
First Dremeled away some of one side
Then soldered on wires and covered with heat-shrink
Then filled it up with hot glue
After the glue set I trimmed off the excess and then a couple of stepped sizes of heat shrink and it came out very nicely
Thanks Sideshow for the tip on the hot glue.