Motorbike carburetor vacuum diaphragm plunger assembly (configured Jet needle) F

I was in the picture, marked the detailed dimension, please carefully compare the size of the part, and then buy. This piston kit for VLX 400 VLX600 (Steed 400/600) Motorbike for Keihin carburetor, equipped with Jet needle, maintenance more convenient If the same size, in theory, also be compatible with other carburetor used.

Here is a photo of the picture, the picture with the size of the detailed, please, after comparing to buy: