The parts list I posted earlier in this thread says your engine needs Spring - Governor P/N 262282.
Here is the listing at my favourite US parts store, which says 262282 has been replaced by P/N 690376, which costs US$5.18 plus shipping:
http://www.partstree.com/parts/?lc=briggs_and_stratton&mn=132232-0331-01&pd=spring-governor

Here is what it looks like:
http://www.ebay.com/itm/Briggs-Stratton-690376-Governor-Spring-Replaces-262282-690376-/400477078737

I can't find it in the Outdoorking online store.