Perhaps try these guys as well - might be able to get them to ship it with USPS in an envelope? Should be no special fees at the border…
Bridgeport Parts - Quill Housing Assembly - Industrial Control & Automation
Bridgeport knee mill repair parts - Quill Housing Assemblywww.icai-online.com
Let's see how I make out with @van123d 's source in Canada first. But nice to have more options.
FWIW, H&W ship via UPS who insist on collecting brokerage and paying HST. I'm prepared to do that but would prefer not to.