Maybe this chap on ebay can help you?
Soft top roof clip sliders as pictured to fit a Fiat 500C. They are sold in pairs. This saves having to repair your own, risk used or buy the full roof repair kit which is a small fortune. 3 D printed with heat resistant material.
www.ebay.co.uk
I wonder what he prints these parts with. If it's simple PLA they may not last very long and warp when they get hot in the sun.
But for this kind of money I hope he uses ABS