Velux stop cap

On my velux roof window the caps got brittle after 17 years.

I made the part with openscad and tried to make it parametrizable as good as possible.
Have to print two of them and the lower hole was half millimeter larger than top - added a 102% resize to the original file, that worked for me.

Pic3 shows the old part. Pic1 looks much better for me ;-)