GM called all blazers a K5 if you look at the 69 to 72 service manuel it even makes not of this, may have somethimg to do with there not being any 2 wheel drives made till late 71. From 73 up the blazer is call a 2 door wagon in the service books and the suburban is call justa wagon, even my 2001's owners book calls it a wagon., there are no C5 emblems in LMC or Chevy duty toy books.