And a new drain plug too!
Early versions of Smart cars required the oil to be sucked out of the motor.
The 451 has a new spin on filter that I bet Fram/Napa/Wix and others will have a good cross reference to. Some of the Brit Smart sites show the various aftermarket air filter modifications...looks like the factory element will also be easy to find at AutoZone/Napa/etc..
May take a while, but I think other wear parts like clutch disk, brake pads/shoes, and shock absorbers will be readliy available before the initial usefull life is exceeded