I'm in the process of rebuilding a 1973 LoBoy 154. I found that a very good match for the original white paint can be found at Ace Hardware. It's in rattle cans and is "Ace Premium Enamel" high gloss and the color is "IVORY". I got it for $3.99 / 12 oz can. Cheap enough????
I also painted the Yellow components with Krylon Industrial Enamel, color is almost a perfect match. Krylon's color is "Federal Yellow" and I bought this paint from MSC Industrial Supply (on-line)
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I also clear coated everything with 4 coarts of CLEAR. All rattle cans..
It's one "pretty tractor" now.