Your amended return would only reflect additional stimulus payment due you if you didn't receive all of your 1st and 2nd round stimulus payments and you entered the amount you did receive when you filed the tax return. It would not reflect any of the third stimulus payment as that is not entered on your 2020 tax return to begin with.
If you entered the amount of 1st and 2nd round stimulus payment you received on the original return, you don't need to enter anything about it on your amended return. You do need to enter the amount of refund you received on the amended return though.
In part III of form 1040-X you enter a description of why you are amending the return, which is this case is to add a deductible IRA contribution of $7,000. It is assumed it was done on time, as otherwise it wouldn't be deductible.
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