No, nothing special to do.
But be careful, the terminals are reversed compared to most batteries.
I know that AutoZoen carries a battery that will work, although it is a smaller case. The E36 has a second mounting point for the shorter case, not sure about the E46. I have put BMW batteries in the E46.
And if you leave the car for a long time, I suggest a Battery Tender.
'95 Alpine M3 LTW
'00 Dakar M Roadster
'02 Topaz M3
Red/White SRF #4 (Chassis 561)