Probably not many but that’s beside the point.
Take your pick from the available legal components for Evolution Class 2021
AIR COOLED MOTORS
CR 450, 480, 500
YZ 400, 465, 490, 500
RM 400, 465, 500
KX 500
XR 500, 600, 630
TT 600
TC 510
ATK 605
MC 490
KTM 500
DRUM BRAKES
any DUAL Twin leading brakes set up
any SINGLE leading brake set up
NON LINKAGE
2001 Husaberg FC frame, seat, tank, fork, PDS shock
KTM SX / EXC frame, seat , tank, fork, PDS shock
In 2002 it advances forward again, 03,04,05 etc etc.
A reasonable thinking person should have jerried to the fact that when Evo was moved backwards to the Classic Era all reference of Post Classic component availability should also have been removed.