Finally done, but what a PITA! I mounted the brooklands legs with 12mm M5 countersunk underneath through the band, which was trouble, because the M5 domeheads are really a bit big for leg castings and don't leave much room for nuts as they are designed to have countersunk screws go in from the top. I had to chamfer the domehead nuts with a grinder to get them to fit. It looks like others maybe used M4s which would give a bit more room. For the side mirrors, I went for Lucas style door mirrors, but I didn't find any that had removable studs, so I cut the M8 studs off the mirror arms, drilled M6 holes as deep as I dared, and cut threads into them. They are held with a countersunk 10.8 M6 bolt each to the band I was looking for the full retro look, so tried MGA style center mirror - too wide between the screens and not that well made. I tried MG-TD mirror - nice, but the base is too wide for the caterham band. I finally found the Halcyon 770 small mirror, very nicely made and it looks to be the mirror Caterham uses for the 160 'supersprint'. A few tips, if I did it again, I would start by installing the two inner legs, one hole at a time, bolting the leg down and using the other hole as a drill guide, then mount the band on the car as it does flex a bit to the shape of the car, then use the screen to place the outer leg at the correct distance. Also would recommend to put some masking tape on the scuttle as the band will come on and off 20 times before it's done. Anyway, looking forward to spring for the opportunity to try the new setup.