This regulator will work on E tanks
https://www.amazon.com/EverOne-Oxygen-Regulator-Liters-Connection/dp/B07L9P7V55/ref=sr_1_fkmrnull_1_sspa?keywords=25plm+oxygen+regulator&qid=1554376658&s=gateway&sr=8-1-fkmrnull-spons&psc=1
This one will work on the M and M60 tanks
https://www.amazon.com/Oxygen-Regulator-Standard-Body-CGA540-protector/dp/B00BXRBJG8/ref=sr_1_fkmrnull_3_sspa?keywords=540+CGA+oxygen+regulator+0-25lpm&qid=1554376819&s=gateway&sr=8-3-fkmrnull-spons&psc=1
The mask can be found here
http://www.clusterheadaches.com/ccp8/index.php?app=ecom&ns=prodshow&ref=clustero2kit