AN A319 DIVERTED DUE TO INABILITY TO PRESSURIZE CABIN ABOVE 9000 FT. FOUND LOWER CARGO DOOR SEALS IMPROPERLY INSTALLED.

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UPON ARRIVING TO WORK AND GETTING MY JOB ASSIGNMENT; THIS WAS REPLACING THE CARGO DOOR SEALS (BOTH DOORS FORWARD AND AFT) ON ACFT X. I FOUND BOTH SEALS HAD BEEN REMOVED AND DISCARDED. SO THERE WAS NO EXAMPLE TO SEE BEFORE STARTING THE JOB. THERE WAS 1 SEAL IN AN AIRBUS PARTS BOX AND IT MATCHED THE EFFECTIVITY FOR THIS A319. THE BOX WAS ALREADY OPEN; SO I TRIED TO VERIFY IT WAS THE CORRECT PART. I FOUND THE PART NUMBER WRITTEN ON IT WITH A BALLPOINT PEN; NOT STAMPED. THERE WAS NO OTHER MARKING ON THE SEAL AT ALL. I WAS INFORMED THAT THERE WOULD BE ANOTHER SEAL COMING LATER THAT NIGHT FOR THE OTHER CARGO DOOR. BOTH CARGO DOORS TOOK THE SAME SEAL PART NUMBER. I PULLED THE AMM AND PRINTED IT. AFTER READING IT; I LOOKED FOR THE OTHER MARKINGS ON IT; LIKE THE AMM STATED. IT STATED THAT THE SEAL SHOULD SAY 'LOWER DOOR' ON IT. THIS MARKING COULD NOT BE LOCATED ON THE SEAL. I PROCEEDED TO GO AND INSTALL THE SEAL THAT I HAD WITH THE INFLATION HOLES ON THE INSIDE OF THE DOOR FOR THE AFT CARGO DOOR. AFTER COMPLETING THIS; I HAD ABOUT A 2 HR WAIT FOR THE OTHER SEAL TO ARRIVE. WHEN IT ARRIVED; I INSTALLED IT IN THE FORWARD CARGO DOOR. I DID NOT SEE A MARKING ON IT STATING 'LOWER DOOR' EITHER. AFTER INSTALLING IT; I FINISHED THE PAPERWORK AND RELEASED THE ACFT FOR SVC. THE NEXT DAY; I HEARD THERE HAD BEEN A PROB WITH PRESSURIZATION AND THEY COULD NOT PRESSURIZE THE CABIN ABOVE 9000 FT ON THEIR FLT. I COULD NOT REMEMBER CHKING THE PLACEMENT OF THE INFLATION HOLES AS STATED IN THE AMM52-31-18-410. I NOTIFIED THE MECHS ON FIELD SVC WORKING THE ACFT AND SUGGESTED THEM TO VERIFY WHERE THE INFLATION HOLES WERE ON THE FORWARD DOOR. I ASKED THAT THEY ALSO VERIFY THE AFT DOOR SEAL INFLATION HOLES LOCATION. I DIDN'T HEAR BACK UNTIL OCT/THU/05. THERE WERE A LOT OF HUMAN FACTORS THAT LED UP TO THIS. THE MOST DISTURBING PART THAT THE SEAL; I DIDN'T THINK WAS MARKED CORRECTLY. THE LIGHTING IN DOING THE JOB WAS LESS THAN ADEQUATE AND THE WX WAS BECOMING AN ISSUE (COLD). IN REALITY; THESE ARE ALL EXCUSES; BUT CONTRIBUTING FACTORS WHEN THEY ARE PUT ON ONE ANOTHER.