I just found that HSP has updated their 1913 QD mount. The new Thorntail X 1913 QD mount has a smaller footprint than the original design while having greater tensile strength.
The 1913 QD Sling Mount is ideal for two-point slings and accepts all standard QD Sling Swivels or can be used as an attachment point for other types of sling hardware (HK Hooks, ULoop, paracord, etc.).
haleystrategic.com/shop/hard-goods/thorntailx/thorntail-x-1913-qd-sling-mount