I bit the bullet and ordered some gaskets for XML reflectors and XPG size led’s to see if any of them worked. This and this fit my Convoy S2, S6, and S2+ round bottom reflectors and a XPG led. I also ordered this and it fits my Convoy M1 reflector with the XPG. However unless you sand it down it will probably sit too high on the led. Or you can take off the old gasket on the reflector and use one of the ones above.
Not sure if this is of any interest to anyone but I am planning on putting in XPL leds in some of my lights and I needed gaskets for the XML reflectors.