I have been reading the novel Tarkin and it describes the Corvette that Tarkin is in charge of. Here is an excerpt:
At just under 150 Meters in length, the corvette fit neatly between the old Judical cruisers and Corellian Engineering's new-generation frigates. Heavily armed with turbolasers, ion cannons, and proton torpedo tubes... the triangular-shaped ship was unique in having cloaking technology.
I don't see anything here that suggests it couldn't be the raider and at 150 meters and a triangular shape it seems to fit the bill.