The pair won through from a field of almost 200 players at Hull City Hall to claim two of the four BDO qualifying places on offer, with a further two spots to be decided at the European Qualifier later this month.
Fordham was the 2004 Lakeside Champion and is also a former World Masters champion who also had a two-year stint on the PDC circuit, but celebrated his return to form by securing his place at the Wolves Civic for the Sky Sports-televised event from November 7-15.
Fordham defeated Ivy Weishlow, Craig Robertson and Neil McDougall in the early rounds before knocking out Canada's Jeff Smith - a Lakeside Championship semi-finalist in January - in the last 32.
He then overcame Wales' Tim Jones to reach the last eight and edged out Northern Irish pair Darren Clifford and Neil Duff with 5-4 victories to seal his Wolverhampton spot.
American ace Butler, meanwhile, overcame former Grand Slam of Darts champion Scott Waites 5-3 in their decider as he won a place in the 32-player tournament.
He began the day with wins over Barry Copeland, Steven Warnock, Paul Green and Sean Fisher before then knocking out top seed Glen Durrant 5-4 in the last 16.
He also went all the way to a deciding leg against Wayne Warren before his victory over Waites saw him progress to Wolverhampton.
American ace Butler famously won the World Matchplay back in 1994 and is more recently a World Cup of Darts representative for the USA alongside Darin Young.
The duo join BDO stars Scott Mitchell - the reigning Lakeside Champion - Martin Adams, Martin Phillips and Geert De Vos in the SINGHA Beer Grand Slam of Darts, with the final two BDO qualifying places to be finalized.
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