Thanks Pinky, you are right there is a photograph showing the bracket (four angled clips that support the bogie wheel), it is the one with the 8072nd's M4A3(105) HVSS with sand shields. I had not looked closely enough. I had been looking for a bracket with no wheel in place - the colour contrast on that photograph is such you can see the bracket. Well spotted.
I only found the page after initial assembly of the M4A3E8, it is well hidden ^__^.
Somtec - the IDF ones are bolted, but only using three bolt holes, Pinky's find makes it look like the TOD ones are held in by gravity.
Somtec and Ripley, that is a possibility, but not convinced that it is within my capabilities. You could use two copies of the rear bogie wheel to remove the flat spot. The existing bolt holes and stub axle would need drilling out.
I will need to look at them for the sizes. I think the tyre is proportionally too thick for the Cromwell wheel in a smaller scale.
Thank you for the ideas.
Not quite off topic, but does anyone know why one of the spare VVSS bogie wheels is in two parts?