unknown body posts - which car do they go for?

[V12]

A friend bought such body posts in a bulk.
They are perfect for the onroad cars we use.
Now I try to find them for my own cars.
I had some ideas and was searching already, but I can´t find the manufacturer or what car they are intended for.

Overall length is around 85 mm. Diameter is 6mm.
There is a small square extension at the bottom. Maybe lock into a bumper at the original car.
Another special detail are four stripes at the lower part of the body posts. Might be designed to make them stronger.

Someone have seen such body posts before and know which manufacturer or car?