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For GMS, you must be a GM employee or a relative (sibling, mother/father, including outlaws, child, including step children, etc.)
What you are probably talking about is GMID, or Supplier Discount. GMID (GM in the Driveway) is a discount any GM employee can obtain for anyone, other than those eligible for GMS. GMID discount is the same as a supplier discount. Employees are allotted only two GMIDs per month.

For a GM employee to give a GMID discount, the person must send the GM employee their last four digits of the social security number and date of birth, along with a valid email address.
The SSN and DOB are compared by the dealer with the dealer system to verify the GMID number is issued to that person. The valid email address is required for the authorization number to be sent to the person from the GM site.

The other thing you have to confirm is that the dealer will accept a GMID, it is up to the dealers to accept this discount, they are not required to by GM (same goes for GMS discounts to the employees).

If you are interested, send me an email with your last four of your SSN, DOB to my private email account. PLEASE call your dealer first to make sure they will accept the discount. As long as the GM system is up and running this holiday weekend, I can get you one. However, Holiday weekends are notorious for EDS to perform system upgrades, and sometimes the system is not up and running until the Holiday is over; which means I could not send one out until Tuesday.