http://www.marcospecialties.com/pinball-parts/03-8785-SET
new set at marcospecialties $113 NOS
http://www.marcospecialties.com/control/keywordsearch?SEARCH_STRING=boulder
boulder garden $6
they also have 37 pages of parts for just WH20
not sure if these help I don't own this game yet
good luck and happy gaming