Thruxton Which Genuine Indicators

I’m keen to hear from anyone who has fitted the genuine triumph led indicators to their Thruxton.
I’m not sure which ones to buy.
They will be mounted on my my genuine triumph tail tidy.
My quandaries are as follows:

Length small vs medium
40mm vs 64mm diameter (edging towards 64mm = easier to be seen)
Multifunction vs non multifunction (not sure multifunction works with the R)

One thing I think I am sold on is the round ones opposed to the long thin ones.

Anyway any advice is greatly appreciated.

Thanks


Scrap the original request. I have ordered a set of medium length for the rear.