>Zip drives are 3 1/2" devices and fit that form factor, so any IDE  
>zip drive should fit in that slot.

Not true.

Zip drives are 1" high, that much is true, but the mounting pattern and 
fastener size differs significantly from the 3-1/2" industry standard.

Hence, different sleds are required.

Beige G3 MTs accommodate the differences by providing mounting holes for 
3-1/2" floppy and Zip drives, 3-1/2" hard drives, and 5-1/4" hard and 
optical drives, all on the single sled. Other models provide different 
sleds for the different drive types.

Industry standard 3-1/2 drive:

Depth: 5-3/4" (146.05mm)
Offset from front to first set of screws: 2-3/8" (60.33mm)
Offset from front to second set of screws: 4-1/8" (104.78mm)
Distance between screws: 1-3/4" (44.45mm)
Width of screws: 3-3/4" (95.25mm)
Screw size: 6-32 UNC
Units: Imperial

Zip drive:

Depth: 6-7/16" (163.51mm)
Offset from front to first set of screws: 35mm (1.3780")
Offset from front to second set of screws: 105mm (4.1339")
Distance between screws: 70mm (2.76559")
Width of screws: 3-11/16" (93.66mm)
Screw size: M3-0.5
Units: mixed metric and Imperial


And, if the above wasn't enough, Mac PCI card mounting is nonstandard.

Standard PCI mounting: 6-32 UNC

Mac PCI mounting: M3.5-0.6

The diameter of an M3.5 fastener is so similar to a #6 fastener that many 
are tempted to use a UNC screw in place of a metric screw.

A damaged case is usually the result as UNC screws are usually hardened 
(or are work hardened during the "thread rolling" process), and are 
harder than the mild steel case parts.

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