A B737-300 WAS DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT L NOSE TIRE; A B737-700 NOSE TIRE INSTALLED.

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I RECEIVED ALL PARTS TAGS; VENDOR CERTIFICATES; AND PARTS TAGS FOR ALL WHEELS AND BRAKES. I REVIEWED ALL THE DATA FOR CORRECT INFO AND CONFORMITY BEFORE I FILED 'SPARES;' ENTERED PARTS TAGS ONTO THE WHEELS RPT; AND FINALLY PURGED THE OLD TAGS. ON THIS OCCASION; I NOTICED THAT THE #1 NOSEWHEEL INSTALLED WAS FOR A -700 SERIES ACFT AND THE #2 NOSEWHEEL INSTALLED WAS FOR A -300/-500 SERIES ACFT. AS A RESTR UNDER ATA 32-20; IT IS UNACCEPTABLE TO MIX THESE WHEEL ASSEMBLIES ON THE NOSE POS. I DISCOVERED THIS ERROR ON JAN/SUN/03; AND AFTER INFORMING THE SUPVR; WHO CONTACTED SOMEONE IN QUALITY; THE WHEELS WERE CHANGED THE NEXT SUN; JAN/03 IN ZZZ. THIS WAS THE SECOND MISMATCH I HAVE SEEN IN THE PAST 6-8 WKS. I DO NOT KNOW WHAT CAUSES THESE ERRORS. TO CORRECT THIS; I WOULD SUGGEST RECURRENT TRAINING. IT MIGHT HAVE HAD THE WRONG STAMP ON THE PART; OR USED WRONG RACK TO STORE THE TIRE AND MIXED THE -300 TO -500 NOSE TIRE WITH -700 NOSE TIRES. THEY COULD EASILY BE MISMATCHED. IN THE FUTURE; WE SHOULD HAVE SEPARATE RACKS FOR -300 TO -500 AND -700'S. THAT WOULD BE VERY DISTINGUISHABLE BTWN THOSE PARTS. THAT WON'T HAPPEN TO ANYBODY ANY MORE.