I am debating a similar upgrade. I already have a black leather Moto Lita like that above so just a boss to match needed.
Your leather one looks like the MotoLita I have on my Roadster.
You can still get a centre boss / horn push from Williams but the price seems a tad ambitious
https://www.williamspartsshop.co.uk/stainless-steering-wheel-horn-push-865-p.asp![[Linked Image]](https://www.tm-img.com/images/2023/11/19/My-dashboard-and-wheel.jpeg)