I bought this kit for my Bernina 930 but never even opened it, but I've since sold the Bernina so have no use for it.
https://www.parrsfreemotionrulers.com/product-category/kits/ (See Bernina Old Style kit)
I have this kit plus Ruler 31b which you can see on their site (all never used).
It cost £82.00 plus postage. I'm hoping to sell it for half price - say £40 plus £4.00 p+p.