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Hi, I'm looking for a pair of chrome trim cups that go under the gauges of a 750CSR or a place that I can get hold of these. Alternatively, can anyone suggest a pair of gauges that would be compatible with a KZ750CSR please?

Howdy. The diagrams at Partzilla have cross-reference info. www.partzilla.com/catalog/kawasaki/motor...twin-kz750-m1/meters
The following models use the same basic meter assy, but the speedo & tach features can vary. The 750-CSR has a lower redline. 
A quick way to check for yourself is to x-ref the meter bracket >> if the meter bracket is the same, then everything else from the models listed will physically swap.  I have the 650-CSR & already checked into this stuff. hee.

1983-84 KZ750K Twin Ltd Belt. 
These should be a close match if not the same as the 750-CSR. redline should be the same. the 84 model was sold in Canada. 

81-83 KZ650-CSR.  80-83 KZ750H Ltd.  81-82 KZ1000M CSR.
these are chain drive models. some 750-4 Ltds are shaft drive w different meters. 750-CSR has lower redline.

Thank you Sir, and very nice photos of your 650 as well.