Where can I get a Mk1 lower bonnet catch?

The pinch bolt holding my bonnet release cable was seized solid, and I've sheared off the cable clamp. I thought this would be an easy part to buy but looks like they're obsolete now and nobody has any. It's the original part 171823509 I need, not the later part starting 191 which is readily available.

Anybody know where I can get one?

Try ebay, https://www.ebay.com/p/VW-Mk1-Jetta-Rabbit-Caddy-Cabriolet-OEM-Hood-Latch-171823509-Ships-Fast/1934201433

Or a wreckers near you, I think you call them breakers.

Irish
http://www.air-cooled-parts.com/cat/product_info.php/171823509-bonnet-catch-lower-all-models-783-golf-171823509-p-40779

That was but a quick google.