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Just out of curiosity why dont you measure the one you have? What if the other one is shorter and you order the wrong one. If you do not have a metric tape, I do not either but I take a piece a string or twine if you can reach the entire hose length use the string to measure it, measure your length and convert it. There are all kids of online converters.
I'm actually not at the house right now, so the truck isn't around. I'll measure it as soon as possible. I'm going to put the description of the two parts on here so that everyone can see them. I didn't realize that the parts page would just redirect to the main catalog.
If it is not 17.4mm, will the other one be wider or thinner?? I've seen a lot of posts about these not fitting, but it seems that mostly I've seen that on Expys and one case where it was a '97 F150.
Anyhow, the descriptions for the separate parts are:
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.