I made the mistake of ordering the standard spacers.. didn’t fit the MRA and sent them back to Jamie for the MRA specific ones. Jamie is a good guy!
Mine is now sorted. I cut the standard screen down to 310mm with the Dremel. Wind buffeting/roar is no more. I can even hear my music at high speed.
Cheers, I'm really pleased with it and it was easier than I thought it would be. Took me about an hour to cut and sand up the edge. Just need to get it tinted now and the job is done.