You can get a non hardening teflon sealant @ NAPA . I will go outside and try to find a part # . True Hylomar is difficult to find . Amazon , if none of the Rolls Royce dealers in your area stock it . Order some for down the road .
If it were me , I would use Loctite 515 in place of the gasket . It is an anaerobic sealer and you can use it alone or with a gasket.