If you mean the 5.1/4 diskette drive i believe any of them will work.
A lot of 3.5 drives can be made to work as well.
I have the wire mode for many models.
Below is a link to where i found them.
http://www.pitsch.de/stuff/amiga/floppy.htm#A4i tried this on several drives and it works beautifully!
Also i may be able to scan and put up the power supply schematic soon.
So maybe you can repair the supply you have! unless of course your missing it. they really are not that complicated. Pulse width type i think!
There is also a possibility to retrofit another supply going by the voltages and pin outs described in another thread hear.