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For PX/FX, UST, and RX Series Helmets. According to Bullard these are the helmets that this will fit, you said you have a UST then this should work.
I'm not sure what a FH 2100/2100 is, A Fire Dome Helmet is what Bullard uses a to describe their structural fire helmets. The R637 will work on the following helmets;
PX / FX, UST, and RX Series Helmets.
Yes they will fit, and they are included with the R921
All you will need is this P/N # R921 Inner Crown system, includes the following;
Inner shell with Impact Liner
Sure Lock Ratchet Headband
Cotton Crown Pad & 6 Point Nylon Crown Strap assembly