Or try these ones
http://www.ezonpro.com/products/familyVehicle/86yHarness.shtml
Millions of family vehicles are equipped with unsafe lap-only rear seat belts ... yet retrofit shoulder restraints are unavailable or extremely expensive.
With E-Z-ON's UNIVERSAL HARNESS, your back seat passengers will enjoy the same level of protection as airline pilots and race car drivers.
* FMVSS Tested
* Costs hundreds of dollars less than dealer retrofits
* Easy to install and use
* Made in the USA
* Tilt-lock adjusters make the harness easy to adjust to any height
* Use 66-168 lbs. in passengers cars and trucks.
* Factory installed tether anchors can be used 66-80 lbs (unless other wise directed by the owner’s manual). For 80-168 lbs. the E-Z-ON tether kit must be installed.