I have an exhaust leak at donut gasket ( manifold @ pipe )
seems the nut size of existing three spring bolts unusual size???
9/16 doesn' fit to small 15mm lil bit to big
does anyone know proper size - 14.5mm? perhaps 19/32
have 19/32 but not deep well it will fit but it too, seems
lil bit to big - same as 15mm local sears didn't have
either in deep well size

 

if it is giving you that much trouble, IMO i would just get it off anyway i could and then replace it with a matching thread bolt that is easier to work with.