B757-200
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Equipment / Tooling; Human Factors; Aircraft
Reference B757 Aircraft Maintenance Manual (AMM) 12-15-08-301 Oxygen Bottle removal and installation.  AMM specifies use of SPL-8240 Wrench--Spanner (XXX-41 or alternate XXX-8).  These tools both cross to our air carrier's Stock Number YYY-24.   ZZZ does not stock this Spanner wrench and AMM does not provide relief to use standard tooling as necessary if spanner unavailable.  After aircraft departed; I was reviewing the AMM and noticed the required tool; which is not stocked in ZZZ.  Recommend changing AMM to afford ability to use standard tooling and/or stock the wrench in ZZZ.
A Line Aircraft Maintenance Technician (AMT) recommends his air carrier change their Aircraft Maintenance Manual (AMT) to provide relief for technicians to use standard tooling instead of required Spanner Wrench SPL-8240; to remove and install Crew Oxygen (O2) bottles on their B757 aircraft. Spanner wrench was not stocked at their Station.