Drive sprocket covers: what models had them?

[uppercanada]

Is it possible that I seen a 40c with covers on the rear drive sprockets... thought this started with the 420c? Maybe it was an option on 40c?

Maybe it was 420c undercarriage parts fitted to a 40c ? (Is this possible?)

Any MCs ever get the drivesprocket covers?

[JimAnderson]

The track frames and tracks from the 420 series can be put on the
40c.Ideally 420 sprockets should be used but worn 40 sprockets
can accomodate the larger 420 bushings.JimAnderson

[Lavoy]

40's could have come with sprocket shields, both 4 roller and 5 roller.
Lavoy