Good evening Hugh something else to consider when changing the steering wheel is that the majority of aftermarket bosses do not cater for self cancelling indicators or a horn button , there are a few that do but they are expensive , i have used this type
https://www.ebay.co.uk/itm/BMW-Z3-M-...TV7r:rk:1:pf:0 , all it takes is cancel the indicator your self and mount a small "push button switch" on the steering column shroud connected to the horn , for a steering wheel if you can get a Nardi so much the better , hope this helps , Geoff .