If it does not match you could be bummed driving around like a stink bug. Maybe play it safe and wait until you can get something else for the front and do both at the same time. Or check the for sale section or Craigs list for some 6" brand name springs to get you by. I am in the same boat, I only have a few parts for my yota but want to start building on it but it will be lame driving on front springs only.
