Aquatica Type NC Nikonos connector, use with Canon T2i/550D, 7D & Nikon D7000, D300s and D3s housings (1)
Canon EOS 550D vs Nikon D5100: What is the difference?
Amazon.com : Outdoor Ultimate Accessory Package for the Canon EOS Rebel T2i, T3i, T4i, T5i, 550D, 600D, 650D, 700D, Kiss X4, X5, Kiss X6 & Kiss X7i Digital SLR Camera (Which Fits
Canon Strap Clamp 100d and 550d + Nikon D5300 by Snafky | Download free STL model | Printables.com
Amazon.com : FC-100 Macro LED Ring Flash Bundle with LCD Display Power Control and Ring Adapters for EOS 1D/1Ds 7D/5DMarkII/60D/50D/550D/500D/450D/400D/350D/300D, for Nikon d90/d80/d700/d200/d300s/d7000/d5100 : Electronics
SEA & SEA RDX-550D Housing for Canon EOS REBEL T2i / T1i / 550D / 500D
BATTERY GRIP 550D T2I
RF-550D 48pcs Macro LED Ring Flash Light Adapter Ring for Canon Nikon Sony Fuji | eBay