Question about draglites

Well i was wondering how to check to see what the backspacing is on my new draglites so i thought i would check the numbers on them and try to run them on the weld site.

Turns out the rears have two different numbers on them, one is 28-01 and the other is 33-01 ???? Is this normal or what. I checked the weld website and it doesn't seem to have a way to check part numbers.

Can someone help me here? They are 15x8 if that helps.

:SNSign:
 
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