I don't have an 800 number, (you might "Google" their site for one), but the direct number to Tom Hanson, the parts manager, is 949-598-4842, They are in Irving, CA.
Have the vin and he will get the exact bushings. The shipping will probably cost as much as the parts, so you might think about other needs.
I would also add that the sponsor of this site might have them, but I have been using Tom for 15 years
Ed

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Ed
1960 220 SE Coupe (Ponton)
1999 E320 Wagon
2007 E350