I think the D1 is a complete classic - IMHO it is probably the pinnacle of vehicle engineering - simple enough to maintain without complex diagnostics, and what electronics are on it are either repairable, or replaceable, or ignorable without compromising basic vehicle functions - something which can not be said of the later vehicles..
Of the four here, the two '97's will definitely make to the 40 years, always assuming I'm still alive - the third, a 1990 V8i is likely a long term resto, but should survive.. the fourth, a '95, is probably too far gone ... but never say never - it was only really bought as a donor anyway..