A friend had a run of ten of these made for GD body cars. No push rod but we are working on that or you can use the stock one. We've built a GC one as well but don't have it listed yet as we haven't built more than the first one (which was used on an OL car that won the CHCA AWD championship this year).
http://rally.build/subaru-gd-brake-booster-elimator/
Grant Hughes