Is this mystery part a Mark V heater?

[Peter_Scott]

I think that’s a Smiths’ heater possibly XK120.

XK120 heater identification

Awhile back I was the recipient of a Smiths heater passed on from a collection of parts identified as coming from an XK120. The one that came with my '54 XK120, restored and pictured on the right, is similar but different in several ways from the one later received, unrestored, on the left: [xk heater (3)] Aside from the colour difference - a kind of military green v. a bluish grey - “left” features a much deeper core than “right”, and while the covers look physically the same they differ in s…

Peter