Just to point out, earlier models have a snap hook on the dash end that attaches to an eye bolt on the dash. The B pillar end attaches to a shoulder bolt.
Goo luck with your search.
Willy Jeeps use the same eye bolt. It was actually made by the same company for both Toyota and Jeep.

Safety Strap Eye Bolt with Hardware New US MADE fit Willys MB GPW jeep | eBay
This is the safety strap eye bolt for the MB and GPW. This is the eye bolt used to snap the hook of the safety strap onto the dash. This is cast just like the originals and made in the USA. You need two of these per jeep.
www.ebay.com