Back in 2017 we purchased Kestrel FGA.1 XS694 off of a Craigslist listing. The aircraft was stored on property for a time before being sold to a museum in the UK where it is being restored. 

These blades were removed from the engine that was removed from that aircraft and come on a milled based that has been printed with the aircraft info and a planform blueprint. 

They are offered in Stages 1-5, with 1 being the largest and 5 the smallest. Stage 1 measures approx. 3.25" tall and Stage 5 approx. 1.75" tall.