Igniter No.75 AT grenade Mk1 :

Length w/o detonator :
Length w/detonator :
Diameter tube :

Photos below © Tony.

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Igniter No.75 AT grenade Mk2 :

Photo © M. Jochoms.

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Detonator No.83 for No.75 MkII :

The "detonator No.83 consisted of a bakelite body (a) on which a detonator No.27 (b) was placed.
In a cavity of the bakelite body a glass ampulla (c) was placed on which a small pin (d) was set to crush the glass.

Measurements on scan below are in centimeters.