Cabinets and power supplies for drives are described below. You should confirm your power supply connectors will mate with whatever drive you get. Also, watch for drive model numbers and model variations. For instance, the Shugart 800 vs the 801 is only a matter of some jumper changes. There have been some questions about adjusting the rotation rate of floppy drives.
Floppy drives rotate the floppy on a spindle, which is driven by some motor.
AC powered spindles don't have an adjustment, the AC line frequency and the mechanics set the speed. That spindle often had a decal or lable which consisted of a series of black bars, radially around the edge of the spindle, a kind of star-burst pattern. Typical rotation speeds are 300 RPM and 360 RPM, depending on the drive size and density of the diskette's format. Those lables are actually stroboscopic patterns. If it was slow or fast, the pattern would appear to rotate slowly.