I may as well chime in on this lol. My two Model 2's are as follows:

#17,000 - 290mm, circlip axles (transitional?!)
#54,000 - 280mm, circlip axles

Re the topic of rivets or bolts on the badge, my 17,000 with a Model 1 badge came with one side alloy riveted and the other with a brass dome nut. Still not 100% sure which is correct, but I'm leaning towards the rivet based on this image from the March 1957 ad:

[Linked Image from i.imgur.com]

Last edited by unkiemonk; 08/04/14 10:51 PM.