Unable to locate an acceptable replacement thrust spring for my AA truck restoration, an original spring was borrowed and provided to Burt's Model A Center, and they had several new ones made at a local spring manufacturer that match the original specs.
![Smile :)](./images/smilies/icon_smile.gif)
This is the AA-4822 thrust spring that is part of the AA-4802-B coupling shaft and housing assembly for the 30-31 bevel gear rear end configuration.
See below for assembly photos (from Neal Wilson on the AAFords-FMAATC website), along with a photo of the new spring replacement.