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... and I believe this would be a four stroke base unless the two stroke model used the same base but with an adapter plate.
G'day Paul
As you know, these 'blue' Sunbeams pre-date Sunbeam's ownership of Victa.
There is good evidence that there was one chassis, and an adaptor plate
was used for the Kirby 2-stroke in the 1960s.

https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/76657/SUNBEAM_-_Lawnkeeper_2_&am.html

This was not the case for the Victa 'orange/brown' Sunbeams.
The base was purpose-built to accept the Victa 125cc and 160cc 2-strokes.

I think that's right ...

Many thanks for saving this important mower.

Cheers
-------------------------
Jack