Depending on what power your wanting it might be worth going down the same route as me.
I converted mine to a push clutch using an Alfa 164 v6 fork
With early type box top and bottom bushes.
The slave cylinder mounting was cut,and welded opposing,which is all that's needed.
Push clutches are on average £200-£400 cheaper.
It then gives you a much broader scale
Of clutches.
Mine cost £650 individually as opposed To £1200 buying the parts from one company.
Helix components,pressure plate
From Mardi gras and friction disc from Cg .
I matched up the numbers in the catalogue and once you have those even eBay offers good helix clutch components.