The confusion is that back in the day you could by a Esc Cos from your local dealer in either Lux, standard or motorsport trim. Lux being full spec with either cloth or leather, standard having a lesser spec and a Motorsport being a lesser spec in White.
In the same era you could buy a bare shell from Ford so you could build it up from scratch for racing and whilst bare do the seam welding/roll cage fitment etc
A M-Sport shell would be a shell that was bought from Ford and modified by the company M-Sport adding the rollcage seam welding, turretts, the pick up points for group-a/wrc equipment and all the other things M-Sport do to there shells. M-sport built the Ford Motorsport GRP-A/WRC shells so would have had the funds and developement to do proper jobs, most where LHD but a few where RHD (like the one on ebay
) and Tommy Fields present yellow monster
