You mean this?
I don’t think so. Quite a huge gap, this centering ring used in my S2+ only fits for 3.75 mm LED, not 3.5 mm.
(S2+ red w/ OP reflector and 519A 3000 K, bought August 2024 from Simon/convoylight)
I think I will tell Simon about it. I’ve noticed the same thing with an S2+ with SST-20, except that the light image doesn’t look quite as good because of the SMO reflector used.