UPS has their own brokerage firm as well, so they make sure everything they ship across a border goes through brokerage. I buy a few things off ebay from the US, and if I get the seller to ship regular old US postal service instead of UPS, the item rarely get's caught up at customs. I have never tried it with Healey parts though.
I found "Precision Sportscars" in Toronto that will ship me a new pump for $188 Cdn (approx $140 US)which will take 3-4 days. It's awfully tempting....