I think on-line searches will be your best bet.  I hope this isn't your daily driver, because it might be a while before you find a replacement.  I also hope you have the tools and skills to make the swap yourself because you'll likely spend the rest of your life trying to track down someone who is willing and able to do the job for you.

An alternative may be a brand new Embraco compressor with compatible specs.  Those are readily available through any number of sources.

You can use a piston compressor, The capillary tube has nothing to due with the compressor type.

Or if you want to be a purest, use a WP rotary compressor from a pre 1985 WP built refrigerator, WPs rotary was a better quite compressor than FDs anyway.

John L.