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cleverclock
Low//Life
Depending on the crank model it'll be either the 15mm or 18mm cap you require. Both are 1mm pitch:
https://www.suginoltd.co.jp/us/products/accessory/smallParts.html#pnH4M15PressureBolt
Maybe one of these (or similar) would be a cheap alternative:
https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20181005020145&SearchText=+Shimano+M15+M18+M20