My '48 P15 is losing tranny fluid in the area of the gearshift housing. It appears any loss would be through the o-rings on the selector shafts and past the housing gasket. At one time I found a source for the gasket and o-rings but can't find that anymore.   Anyone have info about resealing the housing and shafts and where these o-rings and gasket can be found? They may be generic--in that case I should be able to source them and can make a housing gasket if necessary (Permatex Ultra-