You're probably best of searching on craigslist/ US ebay - amazing what some people list ... OR seing what Saccyclone (on here) has in his vast array of parts - he's always seeing all manner of Z's in the States - he may have something ... not the most common of parts though ...
You could easily fab a plate with 'held' captive nuts and weld it in I am sure.
Edit: not 'easily' but you get my drift. It won't be seen once the latch is on I don't think ...