Tony;
Welcome to this Forum!
According to my info source (Tuning SU Carburettors, Published By Speedsports, no ISBN No. with configuration chart), AUD252 configuration of the HS6 has DX Metering Needle, Red Piston Spring, and these fitted to the '67/'68 Volvo 144 USA with B18 (1788cc). AUD252 is not shown for any MG year or model.
Rebuild kits for HS should have all you need (0.100" jets, gaskets), and those items which configure carb do not normally get changed unless they are worn/or damaged.
Cheers
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