AN MD80 WAS DISPATCHED AND RECALLED TO THE GATE TO REPLACE AN INCORRECT FO'S OXYGEN MASK. INCORRECT MASK INSTALLED PRIOR TO DISPATCH.

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I RECEIVED A GATE CALL FROM ACFT Y AT GATE. THE FO CREW OXYGEN MASK WASN'T FUNCTIONING PROPERLY. SO; I WENT UP TO THE AIRPLANE AND TOOK THE UNFUNCTIONAL OXYGEN MASK OUT. I WENT TO THE ACFT PARTS DEPT TO LOOK FOR A NEW MASK. WE LOOKED AT THE SHELF UNDER ATA CHAPTER. WE FOUND 1 OXYGEN MASK LOOKED EXACTLY THE SAME; BUT THE PART NUMBER WAS DIFFERENT. SO; I WENT TO ASK THE STORE PERSONNEL IF THE PART IS GOOD FOR THE MD80 ACFT. THEY CHKED ON THE COMPUTER AND TOLD ME IT WAS A RIGHT PART FOR THE MD80. SO; I WENT BACK OUT AND INSTALLED ON THE AIRPLANE. ALL FUNCTION CHKS NORMAL. SO; I SIGNED OFF THE ITEM AND RELEASED THE AIRPLANE. AFTER I CAME BACK TO FILL OUT THE PARTS TAG; THE STORE PERSONNEL TOLD ME THE OXYGEN MASK IS ONLY FOR THE NON-MODIFICATION TYPE ACFT. I CALLED THE COMPANY MD80 COORDINATOR ABOUT THE INCIDENT. THEY TOLD ME THE PART IS NOT GOOD FOR THAT AIRPLANE. AT THAT TIME; THE AIRPLANE HAD ALREADY PUSHED OUT. THEN WE HAD TO CONTACT THE FLT CREW AND RETURN THE AIRPLANE BACK TO THE GATE. AFTER THAT I WENT UP; REMOVED THE WRONG OXYGEN MASK; AND INSTALLED THE CORRECT OXYGEN MASK ON THE FO'S SIDE. TO PREVENT THIS TYPE OF INCIDENT HAPPENING IN THE FUTURE; I SHOULD CHK THE IPC FIRST; MAKE SURE IT IS THE RIGHT EFFECTIVITY FOR THE AIRPLANE BEFORE I INSTALL THE PARTS ON THE AIRPLANE.