These modules do fit in the desktop case with only a slight modification to the floppy drive bracket. Take a look at this thread.
A1200 BPPC Desktop SIMM'sThat said you might be able to remove a small amount of the plastic carrier, but it will probably take more than you think to fit. I doubt you will reach a point where it will fit before you hit some of the interconnects. Better to find a SIMM without the extra parity chips.
Good Luck,
-Jeff