The alloy rear hub came off the '74.5 250 . It is the narrow style to suit the 4 speed motor & Maico only made a short run of them in late '74 apparently . They are hard to find , but come up on US ebay occasionally & fetch reasonably big dollars. The rear wheel that came with the 400 when it was basket case had a steel hub. The shocks are Ohlins classics & they are outstanding. They would be the first thing that I put on any pre '75 race bike . If you are only going to have 4 inches of travel , they may as well be 4 quality inches. I did recently win a set of these shocks on US ebay for a friend to put on his '74 250 elsinore & he is very happy with them.
Thank you for the kind words Wombat . I am very pleased with the way this bike looks.