It was the #61 car, which would have been GTR #14R, and that crash occurred at Sugo. As stated above, it appears they borrowed GTR #04R for the following race at Mine.
I just realized (without a copy of the DA poster handy) that Mine was the last event of the season though, and #14R hasn't shown up in any races since to my knowledge, nor has it been confirmed as any of the converted GTRs that are floating around. That leaves me wondering if it was ever rebuilt or not.
Here's the photo from the crash that BMW.Williams posted in the #13R/#14R thread:
>8^)
ER