I did find 2 different kinds of refills on Amazon. One Anco brand and one Trico brand. Both say they'll fit the 16" Anco assemblies. I've ordered both. One pair was $4 and the other $7.50. I'll check the fitment when I get them in and report back. It'll be a while since they are the only things as my shipping address in the US.
Post up what you find - also if you can, some photos of yours. Maybe '76 was different than the earlier ones. Also some cars came with Trico blades (not bushbutton) even in the 60s. What determined which it got I don't know.
Alan claims the Trico's 43 and 44 series refills will fit the Anco Pushbutton blades. The difference they are little longer and use a clip on the tip instead of being retained between the two claws. I'm pretty sure I've used a 43 as a substitute. you guys know about these wiper blades???
Nothing in the current Anco catalog looked wide enough.
0.380" is the correct width. Who knows Wipers and refills? Especially originals Be curious what you got.