Needed a double buckle to replace one on my kid's stroller, used BroCrow's as a starting point instead of buying one online. This fits my Baby Trend Sit N' Stand Double Stroller. 

I did print the actual clips at 98% so they have a bit more play than when I first printed it, works way better for me.

I printed PETG with 3 walls and 15% Cubic infill.