Pete, I don't own these speakers, but here are the specs from Crutchfields website:
Key Features:
7" water-resistant polypropylene woofers
hard dome tweeter provides clear, well-dispersed highs
heat-resistant, weatherproof grilles
recommended power range 9-35 watts RMS
peak power handling 120 watts
sensitivity 90 dB
frequency response 35-21,000 Hz
requires 2-1/2" of mounting depth and 5-7/8" cutout diameter
1-year warranty
Looks like 5-7/8"....remember, thats just the cutout. Just because you can cut that size hole, dosen't mean you can fit the speaker. Its probably at least 7.5" OD.
Heres the Cruthfield link:
http://www.crutchfield.com/S-V7utffl...p?I=130TSMR165
Good luck,
Scott