I posted this in another topic. The Shure M24H is the only CD-4 cart made by Shure. I believe it is a fairly rare cartridge, and I have used mine with no problems. I haven't tried it out in quad yet because I only recently became the owner of a quad receiver. Once I get it set up, I will test it out on SQ records. Here are the specs:
Moving Magnet Output (1Khz 50 mm/sec)
Freq Response: 20Hz - 50kHz
Output Impedance: 510 ohms
Load Impedance: 47k ohms
L/R Separation 1kHz: > 22db
L/R Balance 1kHz: < 2db
Stylus Tip: Hyperbolic Nude
VTF: 1.0-1.5gm
Mass: 5.8gm
Stylus: N24H
100pF Loading capacitance.
2/4 channel cartridge.
Check
cartridgedb.com to browse nearly all popular cartridges. Great info.