I've got a 1995 Civic LX, and have had the radiator replaced at a garage due
to overheating. I want to replace the radiator cap (also replaced around the
same time with a non-OEM cap) to an OEM cap as recommended in this
newsgroup.

A call to the Honda dealer find that there are two different caps, depending
on the manufacturer of the radiator (Toyo or Denzo).

Problem is, I can't find any identification on the aftermarket radiator to
identify which one it is.