302 Pilot bearing woes

[Andy FIA]

After 4 months having great fun riding my KTM dirt bike, I finally decided to take the cover off the car and drop the Tremec out of the Hi-Tech to find out why it refused to change gear (After only 2000 miles).

The pilot bushing was found to be totally shot, so I deduced that the input shaft must have being doing a slalom! when the clutch was meant to be disengaged.
As this is my first foray into the Cobra clutch, (the car came complete from Hi-Tech) I need some help with the following:

1. What is the OD of the 10 spline Tremec 3550 input shaft at the crank pilot bushing, mine is 0.668" (16.98mm) is this correct?

2. Is there a needle roller pilot bearing available for the Tremec input shaft OD?

3. I ordered a 10.5" Mcleod clutch and hyd T/O bearing with the engine trans combination, is it possible to visibly identify a Mcleod clutch from a Ram etc? The disc has 6 springs on the hub and has no markings apart from "Made in the USA" on the hub and "M" stamped on the rivets. The friction material is of a "cross" shape on the flywheel side.
The diaphragm pressure plate is painted red and has QKV45 stamped on one of the fingers and "Valeo" on the cover.

4. I have noticed that the steel flywheel is very smooth and polished while the pressure plate metal looks to have been hardly worn by the friction disc, and all of the original machining marks are still visible? can anyone account for this?

Any help would be appreciated

Andy