The Paulson 66.7mm and Chipco 43mm racks fit the Jack chips perfect. Only problem is I had a ton of orders for them this week. I am out right now but will be picking up more at the GPI warehouse on Thursday. If you placed an order I will try to get them out on Friday.
https://www.apachepokerchips.com/product-category/poker-chip-racks/
https://www.apachepokerchips.com/product-category/poker-chip-racks/