Dear Bryan,
We have the G1/4" Silver Shining Compression Fitting CC6 V2 For ID 7/16" (11.1mm) OD 5/8"(15.9 mm) Tube, here is the link.
Is this the one you need?
https://shop.bitspower.com/index.php?route=product/product&path=482_483_488_495&product_id=2123