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Gonna throw a spanner into the works here, managed to find this which sort of contradicts what you've found so far so now I'm really confused :lol:
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Valver & Williams rear beams are exactly the same, R5 is a different part number

Exactly the same according to Dialogys

Thing is, I can't get a part number for the bushes from Dialogys as it's not there on the drawings and that part number you put up doesn't exist according to...