PE set for 1/350 Fujimi Hiryu

You got it my man and co IJN carrier builder!

Fujimi makes one for their kit. I found one at Hobbylink Japan and it's discontinued but you may be able to track one down somewhere else now that you know the name. I'll keep looking.

https://www.hlj.com/1-350-scale-ijn-hiryu-photo-etched-parts-fuj11365

There are a couple on ebay from Japanese sellers. You need to make sure they actually have stock though, so ask first - sometimes these sellers are just resellers that list things then try source it and there's no guarantee they can actually manage it causing long delays. But at around 80 USD + shipping I doubt you can get it locally cheaper than that price. NA basesd sellers typically have a mark up of of about +70% of the JPY RPP.

HobbySearch also lists it as 're-stock available'.  Which typically takes about a week.