Hi. I'll let Chris comment but I asked him to post the picture to show the excellent machining work in making the plate. He might sell those separately, however.
This motor is 11" in diameter which is a tad large for my donor car. However, forum member
azdeltawye documented how it fit his 11" DC motor in a Jetta (similar to my car) by notching off some of the motor's face plate so that's encouraging. The thought of 80kW peak power is way too temping to not try...
JR