TN2IC, the NSN for the plate, designation (Maple Leaf bolted on one plastic, chrome plated, blue background, rectangular) is 9905-21-801-5069.
The NSN for the chrome plated, two-piece extesible radio aerial w/one 8345-21-852-5710 flag staff head with Maple Leaf design is 8345-21-852-5710.
Not sure which one you needed. Don't ya love NSN speak? ;D
BTW, there isn't a link for the NSN catalogue, it's on the DWAN computer under Programs: Baseline: Corportate 4 - Logistical and it's the CGCM.