You guys realize there are several other GT40s other than 1075 that have the other style door handles and dual caps?
Yes - P/1074, the other Mirage rebuild, and P/1076, the 3rd JWA team car, which used some extra Mirage parts which were available when it was built in 1968.
The remaining cars, P/1077 through P/1085 (and the later completed P/1086), were built with the original styled door handles (flat horizantal bar type)
PS - I've seen pictures of P/1074 with both the Mirage and the original bar door handles, although it is sometimes hard to distinguish it from P/1084 which replaced it in the JWA lineup, after it was modified as the camera car for "Grand Prix."