I use F1 racetec wings mirrors (all the chrome jobs were too big and therefore made the car look, well, jug-eared), but the centre mounting is a reproduction chrome Jaguar XK120 thang, with adjustible height. Although it looks like a week shaving mirror, is is actually quite effective - it certainly doesn't obstruct one's view and it is shiney, so compliments Brooklands, its mounting strip, the headlamps and so on. Mind you use stainless steel, domed head bolts, countersunk. Got mine from a yacht chandler. The centre mirror, ISTR, came from Europa spares via the internet (google it - a good site. I got my Mr Toad/Biggles goggles from the same site)
Having said all that Richard in France's carbon jobs look GVFM