Your cultivator size needs to be divisible by the size of your planter. I would guess the planter used is a 12 row, possibly a 6 row. If it was a 12 row you could build a 4 row and have it work. If he planted with a 6 row you can not cultivate with a 4 row.
There were "no" 4 row narrow cultivators in production. It would be like finding a 3 or 4 row narrow corn head. They are around, but nearly impossible to find. I would personally find a 6 row and take off shanks until I had a 4 row. I would guess your tractor could handle a 6 row since it isn't much smaller than a 3020. I have seen 6 row cultivators on 3020s. To buy one you go to an auction, craigslist, local paper, or farm paper. Not many dealerships will have a used 6 row cultivator. It is usually between you and the scrap man at the auction.
To determine your spacing use a tape measure. Your tires don't need to be dead center in the row, but I would run them in the middle third.
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