|The Vauxhall Viva model that had the same cross member,brakes,steering rack, steering column and diferential as the Jensen Healey was sold as the 1800 cc Magnum. The engine mounts are slightly different but its clear that Jensen picked them out of Vauxhalls parts bin. I purchased a 1975 Viva Magnum for the useful parts it could donate. The smaller engined 1300 cc Viva cross member looks the same but is not as strong as the 1800 cc car.
There is always much debate on this board about wheel and tyre combinations. The 4 inch PCD is very close to 100 mm PCD used by many other car manufactuers ( Honda Civics, Toyota Echo's, BMW 3 series etc ) If you replaced the Jensen wheel stud with a larger stud, you would be able to move it in the 0.4 mm to suit a huge selection of wheels. This would have to done accurately on a milling machine or similar. The more modest 1300 cc Viva has the same front hubs as the Jensen but a smaller diameter brake disk, I am about to try this modification on some spare hubs I have. The rear drive shafts obviously are not as common so I will have to be sure of accuracy before I look to do them. Any comments ?