It's a 32mm so might have to go back. Only 130mm travel left in the Fox for 27.5" wheels which might be outside recommended geometry for Sirius - fact sheet says 130mm max for 29"?
Reverse mullet?
There's this -https://www.chainreactioncycles.com/mobile/fox-suspension-34-float-performance-series-boost-fork/rp-prod207946/optionsasalist?selectedSkuId=sku846291&
In 29 boost flavour. I doubt you'll notice 10mm extra.
@Dogs started
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It's a 32mm so might have to go back. Only 130mm travel left in the Fox for 27.5" wheels which might be outside recommended geometry for Sirius - fact sheet says 130mm max for 29"?