Honestly you would have to measure it, Ford specs don't allude to part number.
Mcmaster Carr carries them as well as multiple other vendors. If I recall Ford wanted $17 I purchased for $5 a while back.
Base Ford number is 3C650 but you need prefix and suffix to order.
The only things that come up in my mind which would be at your risk would be
1. Zip tie (leaves gap, and they get brittle)
2. Worm drive clamp (never should be used anywhere. Inconsistent diameter for clamping causes pinch points especially with thin materials.)
3. Triple wrap aviation lockwire. I have used this method and it is not perfect either, too tight and you will cut the bellow. But, better seal than zip tie or worm clamp.
4. Measure diameter and size a stepless clamp in stainless for corrosion resistance. Ear clamp companies list range of clamp diameters typically in mm. Just use vernier caliper and order.
Driver side is hard to access but can be done with low pro pliers.
I would pick choices 3 or 4.