I need the same advice please!
I've posted on a couple of the R4 Facebook groups too, but no responses.
I want a roof rack to be able to transport 2 bikes on the roof.
I started my journey with visions of a period correct roof rack (which I can source in France).
But realised then fitting modern cycle carriers doesn't work with old roof rack designs.
So I am now ready to just go modern... but I simply don't know which currently available (square) roof bars fit an R4.
Once I work that out, I can then check compatibility with the square roof bar converter that Thule (and others) sell, which allow modern cycle carriers to be attached to those.
Thule website says that these feet fit Renault 4 gutters:
Thule 20cm footpack for cars with gutters
I never trust AI on websites, so hoping someone here might have experience?
Once I know the feet work, next job is to buy the square bars themselves.
Thule make bars in an array of different lengths:
Lots of Thule square bar lengths here
So next question: Anybody know appropriate length for an R4 roof?
After that, I think I know what I need to do.
Sharing the links here for Thule square bar converters anyway, could be helpful future reference for other folk:
Thule square bar adaptor