Can the Vernier Optics Expansion Kit be used with PASCO tracks?

Yes. The revised Optics Expansion Kit, order code OEK, $169 (shipping March 2009) with plastic bases is compatible with Pasco tracks.

The earlier version , order code OEK-OV, \Contact Us with metal bases is not compatible with Pasco tracks. The number of older kits is limited.

See also:
TIL 1632: Will Pasco dynamics carts work on the Vernier Dynamics System?