Here are the photos of the seat cushion, and it sitting in place in the rear of a Mk 1* carrier. The date on the cushion looks like it might be 1948 in the picture but it is definitely 1943. The dimensions of the cushion are approx 12" x 13".
It appears to be very similar to the cushion in the above photos less the extra fixing straps.
This may not be the only type of cushion that is correct for a UC but it is the only type that I am aware of (I am not an expert).
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