There is some US legislation passed in the last few years that has also buggered it up. Sort of thing if you bought a gasket set from a supplier here and you fell off your bike and died your relatives can sue the supplier, even if you fell off your bike because you rode it over a cliff.
Ok thats an absurd summary of it, but also the reason why such clubs as the AMC club with an excellent spares scheme wil not send to the USA, blame your legislators not us; conversely we can buy from the USA trouble free apart from the customs hit and miss.
The paypal not arrived scam is also a big problem over there, and in places like Italy also.
Its sad because I regularly buy books from the USA which get here no problem, and even an oil painting which got here in 3 days.
The stuff which gets "lost in the post" over there is legendary here among ebay sellers, I once had a hell of a ruck with some woman over a book which she said didn't arrive, it did it was signed for, she'd also could not comprehend that England was 3000 miles away over an ocean.