I thought this might be useful info. These are other bikes that use the same clutch friction and steel plates as the XS11.
FJ1100 C/LC/N/NC 1984-1985
FJ1200 A/AC/AD/ADC/AE/AEC/B/BC/D/DC/S/SC/T/TC/W/WC 1986-1993 (Except 1988)
FJR1300 AS/ASC/R/RC/S/SC/ 2003-2004
FJRT13 AT/ATC/T/TC 2005
TX650A 1974
TX750 1973, TX750A 1974
XJ1100 J/E/F/G/H/LG/LH/SF/SG/SH 1978-1982
XS400 J/K/L Maxim 1982-1984, XS400 RJ/RK Seca 1982-1983
XS650 -2F/B/C/D/E/F/G/H/SE/SF/SG/SH/SJ/SK/SL 1975-1984
YZFR1 M/MC/N/NC/SN 1998-2001
I don't know that they all take the same number of plates, though.
FJ1100 C/LC/N/NC 1984-1985
FJ1200 A/AC/AD/ADC/AE/AEC/B/BC/D/DC/S/SC/T/TC/W/WC 1986-1993 (Except 1988)
FJR1300 AS/ASC/R/RC/S/SC/ 2003-2004
FJRT13 AT/ATC/T/TC 2005
TX650A 1974
TX750 1973, TX750A 1974
XJ1100 J/E/F/G/H/LG/LH/SF/SG/SH 1978-1982
XS400 J/K/L Maxim 1982-1984, XS400 RJ/RK Seca 1982-1983
XS650 -2F/B/C/D/E/F/G/H/SE/SF/SG/SH/SJ/SK/SL 1975-1984
YZFR1 M/MC/N/NC/SN 1998-2001
I don't know that they all take the same number of plates, though.