mario33
Husqvarna
AA Class
I used this link when I ordered them for my TE and assume(you know what that means) that the same ball would work for the Terra. I can't check now but will try to remember to see if they are the same tomorrow.
Can see no link

Assumption might be OK, UNLESS BMW mirror post has been used in TR... BMW mirror thread is different to 'standard' and adapters have to be used. Not a problem, just a nuisance

Or, maybe, it migh be worth considering separate clamp ? Just to protect throttle/clutch better in case of fall... Thinking hard here...
Also I'm thinking about RAM arm length - longer or shorter one ? Longer gives better visibility but shorter is more compact.