Hello from France
Your camera is most probably a pre-1984 model.
The functions carriers of current F-line models are different, but the rail shape and the dovetail attaching the format frame to the function carrier did not change except for the colour, from silver-finish (pre-1984) all Arca Swiss elements are now black anodised.
So at first you could look on eBay for some separate pre-1984 function carriers, they are easy to distinguish, they are silver-finished while all current F-line function carriers are black.
If you go for a modern F-line function carrier, try to negociate with the vendor a possibility to return the item in case they would not perfectly fit your rail and format frames.
The kind of F-line function carrier you could look for, are either the "classic" 1-st generation F-line models for which the format frame is secured to the function carrier with a screw pushing on a moveable part part of the dovetail; or the current F-line model with a spring-pushed clamp. Both will probably fit as far as attaching the format frame is concerned.
More subtle is the question of the fine adjustement of the pre-1984 rail to a modern function carrier, for this It is hard to guarantee that the fit will be perfect.
A good solution would be to meet somebody equipped with a modern F-line Arca Swiss camera and see if a modern function carrier actually fits well your pre-1984 "silver-finish" rail.
I recognise that, living close to Arca Swiss in Besançon, it is easier for me to have access to Arca Swiss spare parts and direct technical support
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