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Beware there are two different PS setups on 7 series, the original Czech one and an italian setup.
The Czech system has the pressure relief valve built into the cast iron pump and the italian setup has an alloy pump with no relief valve and a relief valve hanging off the side (or top) of the ram.
all the plumbing is completely different so best to stick with the same type as on there now
i have just converted my 6745 from the italian pump (broke it) to the more common Czech pump.......... now have 2 relief valves ...... and a new set of hoses as all the fittings are different.
DO NOT try to use a Czech Ram on the itialian pump!!!