Well, I believe post-'73 Reliant screens to be flat anyway! I can't recall any curvature of note, but going back over the past few quotes has just made me realise how long it is since I properly studied a later Reliant at close quarters, despite us having owned several over the years. In fact I'm now wondering which cars I remember always used to be buzzing around town, are still around town....!
On the same subject, the basic mid-section body structure of all post '73 Reliant three-wheeler's are exactly the same, no matter which model or which year it is. The doors, windscreen, dash, chassis, and seats (to name but some major items) are all completely interchangeable between any 1973-81 Robin, 1981-93 Rialto and 1989-1999 Robin. Moving across to the four-wheelers, the 1975-83 Reliant Kitten windscreen and doors are again totally interchangeable between, Mk 1 & Mk 2 Robin, & Rialto three-wheelers, because again, its 99% the exact same mid-section of vehicle. After 1977, the top brass at Reliant were very blinkered towards any further major development of the three-wheeler, so the later years was really a story of tarting up what they already had as a design, rather than any complete departures like the Robin had been over the Regal in 1973.
I deliberately haven't included the 1999-2002 Mk 3 Robin in the above as apparently there were some surprising detail changes made when they produced that model, which others in the Reliant world are better qualified to spot than me. But I'm almost certain that aforementioned mid-section stayed the same here too....
