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MRC have recommended these for Stage 1/2 C5 RS6's in the past.
I am using JD Engineering in Holland, where they have recommended the same over NGK PFR7Q (7963).

NGK PFR7Q's @Opie Oils are GBP95 shipped

Anyone know where you can still get your hands on Bosch f5dp0r?

ebay

As above