Original/correct advance springs for old tractor distributors are nearly impossible to find anymore.
The alternative is to go to an on-line hod-rod supplier such as Summit Racing, Jegs, etc., and buy a generic distributor advance kit" or "distributor re-curve kit" containing an assortment of advance springs, use the ones most like the original in strength and length, then verify the advance is operating correctly using a timing light, swapping springs if it advance too early or too late.
Ideally, one would use a "distributor machine" and have an OEM advance curve spec. sheet at hand, but you are dealing with a relatively low RPM low compression engine and in this case "close" is probably good enough, and certainly better than before you worked on the distributor.
Also, there's lots of videos out there from guys "re-curving" distributors and probably some helpful tips, as well.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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