Ford supplied the "uprated" gearbox to the 11 165hp cars.  I assume there were some extra ones around for warranty etc.  I am in the process of having the gear set in a regular side link box swapped for type 5 internals, so as to return my car to its original 165hp running gear.  My understanding is that you need the matching idler (?) gear as well as the first / second cluster to match gear teeth pitch

Can someone point me in the right direction of finding second gear on these gearboxes. Sounds stupid I know but I'm getting old. I tried to do the same on an early version box that was working on removal and could not do it. My process is that the lever toward bell housing is 3 and 4 with neutral in the middle of that selecter. Second toward rear does 1 and second with first toward rear and second toward bell housing with 3and 4th lever in neutral position and the third lever is for reverse which points down not up. I tried this with the other box today and could not select gears this way. Are the two boxes different. One has breather in the tail my old box the other has the breather in the front near bellhousing on the box section. The one with breather on box section selects gears as above the one with breather at rear stumped me today.

Perhaps these scans of the Type E gearbox from my 'update' '73 Capri Supplementary Workshop Manual may help you with the location of the 2nd gear and its position.

Thanks Johnscapris. It's what I thought but the older box isn't budging. I will try again. The newer box I got must have the older second gear installed.

So your on the road. All the best and yes to alternative options.