You might have to keep checking eBay and obtain the parts piece by piece over a period of time.  Or keep cruising on-line classifieds for a cheap (potentially non-working) donor fridge if you have room for one.

One thing working in your favor is that Frigidaire was a popular brand so statistically speaking there are more survivors and related parts out there than for less common makes, although they've still become scarce some 65 years later.