There where mulitple variants of the floppy drive:
1. i think the first by looking at the closing mechanism

2. the standard with a lever closing mechanism:

and i think they came in black and beige
3. the one i had, a much smaller formfactor, the 1541-II:

Which one you got there ?
but i believe the bigger ones have the powersupply build in ?
mine had a separate adapter like the one from the C64 itself