Baron,
Try "Stancor" (a large White-Rodgers distributor service mark):
http://www.stancor.com
I hit thier site and came up with the two following contacts in your area:
Allied Electronics Inc. Las Vegas 89102 (800) 433-5700
Graybar Electric Co. Las Vegas 89103 (702) 876-9888
I also found another similar data sheet to the previoius one, except this one has the same part with a Stancor part number... . You can see the sheet at the following address:
http://www.kubicki.tv/GridHtrSol_dstrib.pdf
(allow about 10s over 56k to see the doc)
If I look at the p/n breakdown from the first document (in my previous post) and determine the ratings of the part from the numbers Philip posted, then the following Stancor part number listed in the second document is an exact match:
120-901
If you call Allied or Graybar and ask them for Stancor "DC power contactor #120-901" they should be able to hook you up.
Since there seems to be so many different flavors of this solenoid I find it hard to believe that it is an OEM part only... . Even the data sheets list various applications for them... I think its just a matter of finding the right electronics distributor who carries the Stancor (a. k. a White-Rodgers) line.
Good luck and let me know what you find out - Now I'm darn curious.
Rob