L-plate for Canon EOS-1D-Series Mark III and the newer Mark IV.
Includes -1D Mk III, -1Ds Mark III, and -1D Mark IV.

Dual-position mounting is compatible with wireless transmitter, the Canon WFT-E2A. See images at left!

L-Plate User Manual

Specs:

1. Height: 4.7 inches / 119 mm
2. Weight: 6.2 ounces / 176 g
3. Dovetail Offset = 27.50mm
4. Price: $183

L-Plate Advantage:

 

How to Use an L-Plate