What is available to you? There are a few different companies who offer a "buff" or beige primer, the first that comes to mind is Uroprime by DuPont. The problem with letting us tell you is we don't know what you have available to you.
Not all products are available in every area. Sure you could get them on the net or something like that, but it is always best to be able to walk into the store and talk to the people you bought it from.
Go to a body shop or two in town or near by and find out where they get their paint and primer products. Then go by that store (jobber) and find out what they have.