From the Rv12 MM (maintenance manual) version 3.1, page 17-2:
?Rivets
AN470AD rivets may be substituted for specified LP4 rivets.
AN426AD4 rivets may be substituted for specified CS4 rivets
Cherry Max CR series rivets may be substituted for any AN470AD rivet or LP4 rivet.
CCR rivets and solid AN426AD3 rivets, used for attaching nutplates, may be used interchangeably. AN426AD3 rivets are preferred for strength wherever they can be accommodated.?
The complete manual can be downloaded from Vans? website.
-Dave