https://www.stellarvue.com/product/1-f002-mrf-finder?mult=2&&tab_key=reviews
Stellarvue F002
stellarvue
https://www.cameraconcepts.com/stellarvue-50-60-mm-finderscope-rings-mount-to-tak.html
Stellarvue 50 - 60 mm finderscope rings mount to Takahashi - Camera Concepts & Telescope Solutions
Finderscope rings and base that mount most Takahashi focusers.
stellarvuemmringsmounttakahashi