Oracle Delphi Acrylic mat - Madrigal cartridge?


I just bought an Oracle Delphi MK III that came without a mat for the platter. How do I find one of these or is there one for sale among the audiogon crowd? The turntable has a dark brown or black cartridge with a big M on the front already. I don't know what brand of cartridge this is? My friend thinks this might be an old Madrigal cartridge. I need to set my phono stage properly and want to find out about its spec's, etc. What do you know about this cartridge? Any help would be appreciated.
lyonpowers

The following are the specs for the Madrigal Carnegie One cartridge:

Aluminum alloy body
Micro edge line contact stylus
Beryillium cantilever with carbon fiber core and enclosed in aluminum
Weight 6.7 grams
Tracking force range 1.5 to 1.8 g (1.7g recommended)
Tracking angle 24 deg (+/- 3 deg)
Compliance 17 cu
Medium to high mass tonearm recommended
Load impedance 30 to 50K ohms
Output >0.26mV

Regards, Richard.

Thanks for the data - audiogon rules in hell! A "Carnegie" it is! As I'm originally from Pittsburgh, it seems fitting. I just ordered the mat from Audiomax and will try to get the cartridge sounding right. A friend is milling some tiptoes for the turntable and is building a granite stand for it. I hope it enables the music to flow on through. Again, many thanks.