[Scuderia_Turini]

Hello,
Roger Gillham categorises the C23 guide as "G17" and it was only fitted to C23, C20 and C21 cars.
Described as "Blade, base rounded at rear, rear screw fixing"

I don't see any other guides having the rear screw fixing so nothing immediately compatible.
Photograph from page 185of the 6th Edition of The Definitive Guide is not the best but here it is.

Leo

   

Edit:-  There is a Dart C20 on EBay with a photo of the guide from underneath - https://i.ebayimg.com/images/g/M8sAAOSwv...l1600.webp