Divesoft BOV spare o-rings

Divesoft BOV spare o-rings the set includes:

2x o-ring 7,65x1,63 NBR 70SH
2x o-ring 21x2 MVQ 70SH
2x o-ring 37x2 MVQ 70SH
2x o-ring 41x2 MVQ 70SH
2x o-ring 21x2 EPDM 70SH
2x o-ring 37x2 EPDM 70SH
2x o-ring 41x2 EPDM 70SH

Necessary to use only with Krytox GPL-201 in Divesoft BOV.