Maybe a couple of small pieces of persplex in the shape of
the last pic.

Not sure if you can get it in black though, might have to use the
fake carbon fibre stick on stuff to hide the og colour of the persplex
spacers.

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221.7KW-ATW 498.5NM MMS ROLLER DYNO & BUILT BY STi NINJAS, BUILD #318/600

EBISU SUBARU, SHIBUYA-KU TOKYO