The steel 65mm pulley from Poland was IBF. I have been searching but can’t find anything. The original listing on eBay was closed in May of 2018. I would run a stock pulley before I would run an alum pulley. If you are looking for a performance boost you could run a stock supercharger pulley and an aftermarket crank pulley.
I just put in the search on eBay ‘SRT6 pulley’ and down the list is the IBF 65mm pulley, 1,650 PLN or Can$455.
The ad is still there today.