From a relevant thread on the New Ag Talk Forum:
Before buying ANY closing wheel, or even using the OEM wheels, release the spring pressure on your tailpiece and try to move the tail piece from side to side.
As the center to center distance at the tightest point on most closing systems should be just a tad more than your seed depth especially for corn, if you can move your tail piece more than maybe 1/4" side to side THAT should be where you put your money before buying any brand of closing wheels and before planting any $150-$300/bag seed!!!
Lateral movement of the tailpiece means that your closing wheels are not centered over your seed slot much of the time.
The last 7200 was manufactured around 1996 or 18 seasons ago. Most are over 20 years old. The 7200 OEM tailpiece was manufactured out of relatively thin sheet metal.
Most 7200 tail pieces I've seen should be replaced before putting one seed in the ground.The idea that people will plant hundreds of acres of expensive corn seed but balk at the idea of spending $50-75/row to replace or rebuild the closing wheel tail piece on their 20+ year old JD 7200 or 7300 planter defies logic.