Type R Club of America

Who knows how to map Hawk's stamped PN's to brake pad compounds from their website? I have three sets of Hawk pads I'm trying to determine what they are.

All three have:
-Large lower stamp "503-0" which I presume maps to backing plate (ITR/NSX/Prelude/Accord/etc)
-Smaller upper production stamp XXXX

The three (part number?) stamps:
-280S
-25JT
-31MR

Updates - How to break down Hawk Part Numbers by Ravi from We Don't Lift Racing:
Part Number: 521S.800
-First three digits: 521 = shape (ie backing plate / fitment)
-S = Compound
-.800 = Thickness (in)

This Hawk reference chart:
https://www.hawkperformance.com/compounds/motorsports

The production stamps are still TBD so this only helps if one has the pads in their original box.

Update - I have emailed Hawk for assistance.