Mk2 1600E Clutch Disc Issue

[KKCortina 3]

Hi..... small issues re new new Clutch Disc  that I am fitting to my Ser.1 1600E......

 

(1)I have the correct straight-fingered Pressure Plate and the correct hinge-type Release Bearing that fits to the clutch fork/arm..... however, the Clutch Discs I have (all 20 spline for Mk 2's) are different brands (QH, AP, Valeo etc) and have slightly different centre lenghts/protrusions either side of the  splined centre section..... only a few mm's longer or shorter but still different....

 

Does this really matter once the 20-spline clutch disc fits the correct way round (flywheel side to front) on the 20-splined gearbox mainshaft ? (Correct 190mm/7.5" disc width)

 

(2) One other query.....the special Mk2 Cortina Release Bearing is a hinge fit to the clutch arm/fork....... am I correct in saying that the these hinges on the release bearing should NOT be pinched to ensure that the arm does not fall off on assembly....... I have a vague recollection years ago of trying to tighten/squeeze them to ensure arm was secure....only for the hinge to snap off as it was a cast rather than soft metal, thereby damaging and ruining a new release bearing beyond repair!