Ooops... vanishing posts 😱
Anyhoo. Regarding IFSO's free 246 GT. Got it, tried it, found it's encrapted (the bad, sad, mad kind where not only can you not generate custom previews in CM, even using CSP rendering [warning and blue crystals], it actually crashes CM), binned it.
There's a very nice, older 246 GT by Full Throttle,
here (on a blog by someone you might know 🤪). Drives really nicely, nice sound. Didn't check the wipers (sorry). Oldie, but a goodie.
If you save the body shaders from Geroda's GTS as a preset, and then apply them to this one, it becomes moar pretty (it was a leetle bit matte).