170 Brake Return Spring

Does anybody know where I can find a brake return spring for a late 80's 170? I've looked everywhere online and I can't find one. I let my buddy's little brother use my mower and somehow he broke the spring and I can't find the broken spring anywhere. It baffles me that something like that could break on a prime era Deere.

Please find and post the full model number of your tractor. It will be on a black and silver decal on the chassis. Normally behind one of the rear wheels or on the back of the frame. This will help us identify your unit and the correct part number.