Because it has come up recently, here are EOP rules on deposits:
There are our friends "encouraged", "suggests" and "requests".Pontiac EOP Rules #9 Sale Price said:Dealers are encouraged to request a deposit from all customers who place an exclusive retail order. GM suggests that a deposit should be part of
this program and requests that Dealers secure deposits. Customer deposits should be refunded if an exclusive retail order is cancelled or if a
customer is deemed ineligible by Program Headquarters for any reason during the customer verification process.