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Ford Sierra 5 speed box (top view) and MG Midget box (bottom view). For size comparison.

Hillman Avenger 1500 clutch (shown fitted to Midget flywheel with alignment tool) has the correct 23 spline x 1” diameter and is only 6mm bigger than Midget clutch. (7.5” as opposed to Midget 7.25”.) No problem as you can see. It fits without modification.

Now here is an update. I am reliably informed that 1.6 Sierra’s also had a 7.5”dia clutch which will also fit. It’s not what Borg & Beck say,(they say it has 20 splines) but one of “our correspondents” has actually done it and says that B&B’s info is wrong and that it does have 23 splines. You may care to check it out first.

I almost forgot to mention:
The spigot bush in the flywheel needs reaming or boring to fit the Ford input shaft (I actually just drilled mine). I forget the size as I post this but it is I think 16mm. Check first. Some conversions use a special bush about 3mm longer. I found the original one fine. Fit with Loctite, the flywheel stops it dropping out. You may find it was loose when you took it out.

The rear coupling is too big for the Midget tranny tunnel. The donut won’t take the angular movement of the prop either. Shame.