ST54 SCBA CYLINDER SPOON

Q:  What are the differences between the Avon Protection ST54 SCBA cylinder support spoons Part numbers 605580 & 602619?

A:  ST54 Spoon 605580 is the profiled version, slightly gull-winged in shape.
ST54 Spoon 602619 is an older version and is flat in profile.
Both are acceptable to be fitted.
The change in profile was to enable easier access to the handwheel on the regulator.