Wheels + tyres acquired, spacers acquired, extended wheel bolts acquired.

Now I need washers to convert the 60° bolts to flat faced Jaguar style nuts, which have an 18.5mm diameter shank seen here in figure A.

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I'm looking at these Peugeot conversion washers, which as far as my research tells me, only have a 17mm diameter shank, but they are the closest that I can find.

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Will they do the job, or can anyone advise me what to do here, as getting these wheels on is taking years off me lol.