I popped the numbers from Mikes instructions into google and it brought up several purchasing options:

Clutch Plate - 83 BB 7550 DA
Pressure Plate - 83 BB 7563 AA

Both for the 190mm

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10