I could always be proved wrong by someone who knows better than I do, but I don"t think anybody other than a custom builder, built a true 4010/4020 till up in the 90"s.
I"m pretty sure the two on ebay - while listed as a 4020, are actually 3020s. They are too short to be 6 cylinder tractors.
Ertl made LOTS of different versions of the 3020 over the years. Some of them had bigger rear wheels than others. They also made a 5020, but I"m not sure when they first came out.
C&M took a modified 3020 casting and sold some 4020s back before Ertl made any. There was also some 6030s custom built using modified 5020 and 7520 casting.
Do you have any pics of the toys you are talking about?
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