I threw away 4 x 5 1/2" wheels last year. Sadly, they were far too rusty to restore. 3 had holes right through the outer tyre bead area when the tyres were removed and the rust chipped away. They had been on a long dead 123GT. Here's a pic of the centre of one of them. Note date, 1/70. All were dated the same. This one was the best one but had bad rust where the centre joins the rim.