Tony,
I have quite a stash and can confirm your measurements however, can’t guarantee they are XK. I received them in boxes of parts acquired from an (in)famous XK workshop in Sydney some years ago. They may be from MKV, MK7/8/9, XK120/140/150?
I have test fitted in a correct XK 17" steering wheel and extension tube and steering column/bottom clamp and see no reason they wouldn’t fit. Hopefully someone can confirm.
Hi There
Hope you don’t mind me contacting you, I have a MK4 without a manette control for the steering wheel and your post mentions you have some or had some, although it is a mark 4 Jag and some may not fit If you have anything that is close that I could adapt or a lead to finding one it would be much appreciated