LDS MK 5?!?
I think you mean the pair of BT10-based LDS; one fitted with a 1600cc twin-cam and one with a 2-litre Climax. This is South Africa so they were just racing cars, nothing as specific as a F2. And "Mk 3" or "Mk 5" is a designation that was applied later by historians, not by the builder.
The first one was probably built with a view to running in the Gold Star category for 1600cc engines that was introduced after South African F1 moved to 3000cc but that's pure speculation.
Allen
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