The CR125M air boots fit the air filter cage flange very tightly, by design. You will probably need heat and a fair amount of stretching to get the boot on the cage, but once it's on and the clamp's in place it's not going anywhere unless it rips.
The Honda 17253-400-000 and Suzuki 13881-41301 air boots both have 57mm carb-side and 76mm airbox-side openings and @ 75mm overall length, plus an upward offset from carb to airbox.
Ray
_________________ '74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric
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