There are no part numbers for anything related to the latch assembly. Only for the latch assembly itself. If something is broken on one of them you simply have to buy another. Though, that's not to say that one couldn't find a spring, but you then have to find someone who can successfully take this apart and put it back together just to put the spring on. This lever the spring is under is permanently attached to the assembly. Once the swedged out portion is ground off to remove the lever there will be no more material left to swedge out again when done. The assembly that the levers pivot on is made from cast zinc, and does not respond well to welding or "second time around" manipulations.