Sorry for jumping in, but I have a '97 SL with a WarP9 and an EA adapter myself. 
I just wanted to share another driveshaft support option:
I had a racing shop down the street make this and the motor mount for me. Since these cars are identical the template they have should fit yours as well.
I just wanted to share another driveshaft support option:

I had a racing shop down the street make this and the motor mount for me. Since these cars are identical the template they have should fit yours as well.