He's not talking about rear strut bars.
Depends on the shock.
E46 M3 Cabbie mounts are some of the best things from the BMW factory, and you might want to look at those. I'm not 100% that they will fit your car, but if it fits an E30, why wouldn't it fit anything else.
TMS sells some good stuff, and it's worth while checking it out. I purchased their entire mount kit (RSMs and Strut hats) when I did suspension.
I'd go for the E46 M3 Cabbie mounts based on cost and their toughness.