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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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