I made my own gear track mounts using PVC - I got the idea from this video:
https://www.youtube.com/watch?v=In_nSEh1upw
I also like this mount that i attach to my kayak's seat:
https://www.amazon.com/gp/product/B075WTT5Y9/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
Hope that helps!