Here is a step file and a footprint of an Ohmite-RA-T2X-51E heatsink that can be used in KiCad. (Based on a datasheet.) It's 42mm x 25mm planar size, 51mm height, Pins diameter is 2.3mm, with 25.4mm spacing. Your tips and support kindly accepted here: https://paypal.me/ZigaM3 I also design on redbubble: https://www.redbubble.com/people/reintegration/shop And I promote my RB designs on Pinterest: https://www.pinterest.com/reIntegration42