Yes that is pretty much correct
The miters of the 1st Garde Regiment zu Fuss
after they changed to the "new " silver front miters
had side lugs just like their spiked helmets .
The silver , flat chin straps could be removed from
the miter and worn on the spiked helmet
I have an enlisted helmet for the 1st G R zu Fuss
and the chin straps are rather large for the spiked helmet
but would be a better fit for the larger miter .
The KAGGR# 1 is another story .
They were handed down the old miter of the
1st G R zu Fuss for their parade wear.
The chin straps do not have the side lugs to fit on
The Grenadiers are held in place with the flaming bombs
and the Fusilier Batl. with side screws .
Steve