You posted an image of the Dole Deluxe Dispenser (late 1940s).... You may have to watch eBay and wait for a donor dispenser.. a complete dispenser like this one sold last month (Sept 12) on eBay for $135.50 (A Deal)
you could have parted it out and resold what you don't need... On mine, I had to wait over a year till the small grate popped up on eBay... Also.... get the word out... run a want ad here, on soda-machines.com and Facebook.
There is a donor out there with that part... be patient and good luck.