The bushing tube is part of the wishbone and it looks like it is that that failed. I know from bitter experience that it really doesn't take much of a bump, in the wrong place or at the wrong angle, on the M3W chassis to bend it and that will result in a chassis change as a repair by Morgan. It doesn't look like your chassis change was as a result of cracks in the lower forward wishbone mount or the upper rear wishbone mount area. The wishbone failure was probably an unfortunate, isolated case of a bad weld in a critical component, luckily it didn't result anything worse.
