[Fot] TR3 to TR6 front brake interchange parts and info request

[davehogye]

Hello FoT, 
I'm interested in making the change to TR6 brakes on my TR3. I've purchased a new set of calipers and it looks like I'll be needing to change the caliper carrier/mount as well as 10.75" discs. Will the TR6 carrier bolt to the TR3 upright? If not I'll need the 6 upright and steering arm as well. Can anyone share some info on this change? I'll also be needing to purchase the parts for the change other than the calipers and discs. Does anyone have them available? This change has been recommended to me as a vintage legal option. I noticed about a 5 pound weight savings per side in the calipers alone. It seems like a good change to me. Also does anyone know of the difference between the earlier and later TR6 calipers. The earlier version is referred as a 16P. 
Thanks in advance, 
Dave H.