Yeah, curious minds want to know.
The $40 set of ebay injectors I just bought are crap - they show signs of long term disuse, like spider nests in the electrical contacts, so I'll probably buy some from 5.0. At least they won't cause me to pass out from the fumes, or exit this life in a ball of flames.
I do know that the physical things have to match - length, o-ring size, and impedance. Bosch Gen III's look like they might fit, which leaves the electrical stuff - contacts, too, as I notice there are oval connections, now.
Anyhoo, fun? Not so much, as I need a job, too. :wierd: