Here are photos of the jack from my A310V6. I don't know whether it's the same as that on a GTA or R5 but probably similar to the jacks on many Renaults of that era. Ideally the top piece width and shape should be similar so that it slides into the metal jacking points on the car.
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Formed originally for fans of the V6 Renault Alpines including the Alpine GTA V6 GT, GTA V6 Turbo, GTA Le Mans and A610. Owners of the Alpine A110, Alpine A310, Renault 5 Alpine, 5 Turbo 1 & 2, Spider, Clio V6 and all Turbo & Renaultsport vehicles built at the former Alpine factory in Dieppe are welcome and will find photographs, literature and information relating to their cars.