This site has some information that might help you find some alternative carburetors to fit the car.
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www.webernorthamerica.com]
Getting your hands on an original Weber carb is going to be tough or expensive, usually both. The Triumph guys use the same type of carburetor (same series at least) as the Toyota. A search of their forums or including Triumph in your search might point at some possible replacements or rebuild kits.
2002 Corolla S, Silverstream, 1.8L 1ZZ-FE (VVT-i)
2003 Matrix XRS, Cosmic Blue, 1.8L 2ZZ-GE (VVTL-i)