good to find a forum with loads of experience on it!!

I have had a vibration coming form the engine area when the car revs between 2400 and 2600 rpm. Took it into local garage and although they could not confirm it, suspected that the top driver's side engine mount had gone. Problem is that the steel bit that bolts to the engine is no longer avail as a part (tensioner arm is). After looking round here a bit I got wondering... can any one tell me if I need to replace the whole steel arm thing or just the rubbery innards? Is that even possible?
1998, 406 LX 1.8 16v
Mrs has the car out this evening, but can post photo tomorrow if this helps?
Cheers chaps!
Loopster