wTrueman : " is/was a stone guard for this year and would a '28 rad shell be the same as mine?"
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There were no stone-guards made for the 1928 and 1928 Ford Model A radiators. For the most part, the '28 & '29 radiator shells are pretty much interchangable in both bit and function, as well as looks. As Tom aludes to above, for the 'show' or purist, there is a subtle nuance of differance in the crank hole shape.
If you would like a Stone-Guard for your radiator, the reproduction people have made a stone-guard, following the idea of the '30 /'31 Stone-guard, and it is available from all Model A Parts Houses. The modern-day Stoneguards will universally fit either the '28 or '29 radiator/shells. They do look sporty, but did not exist in the 1928 thru 1960 period.
If you are worried about the correctness of the crank-hole shape ('28 vs '29) then you should not wear a Stone-Guard on the radiator, as it too, would not be 'correct'.