I haven't had much motivation to search for reference recently, but today, I was able to find more photos of the Thibault rigs, or more specifically, the variation that is present with them.
The first one is the open cabs, which seem to all be set up with the sirens on the front bumper, unlike the cab models. and a bubblegum light and steady burns mounted on the top of the windshield frame similar to the seagraves.
These two are what the cab Thibaults looked like upon arrival and up until a certain timeframe when the single rotating lights were replaced with Code 3 XLs.
The last two are from (possibly) late-80s up until the mid-90s when the rigs were retired. The white top, I assume, was also a later modification and was only present on the one as far as I'm aware.