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Asked many times before, but does anyone know exactly which luggage rack that is? I remember Bob of ERA posting which rack they've modified/used in the past. But with SA using parts from many different English cars, the luggage rack must come from a specific car, or G.R. ((a trunk mounted luggage rack ala Austin-Healy , Triumph, and MG)), are you thinking that the same rack was used on all three two-seaters you listed; and the Cobra?
An old beat up leather suitcase riding on a stock rack would sure make for more "trunk space", for certain longer trips.