Canon CY1-2497 Lens Mount
Genuine Canon lens mount for the EF 180 3.5 L Macro, EF 300 4.0 L IS USM, EF 400 5.6 L USM, EF 70-200 2.8 L IS USM, EF 70-200 2.8 L USM, and other EF lenses. Made by Canon Japan. See the detail chart below for the proper place to measure your lens mount. Then choose from the most popular sizes. We stock the most common mount 2.10. We can order other available sizes.

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Canon XA9-1047 EF Screws
Genuine Canon shoulder screws for the EF 300 2.8 L IS USM, and EF 400 4.0 DO IS USM lenses and other Canon imaging products. Package of 1 screw. Made by Canon Japan. This screw was made for this tripod collar guide roller.
Canon YF2-2073 Lens Mount
Genuine Canon lens mount for the EF 100-400 4.5-5.6 L IS II USM, EF 70-200 2.8 L IS II USM, and EF 70-200 2.8 L IS III USM lenses. Limited stock on genuine Canon lens mount, as our last order for that part was cancelled due to "Regulation Data Label". Whatever that means. Made by Canon Japan. Use option and select genuine Canon or import lens mount part.
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This product has multiple variants. The options may be chosen on the product page