Good one... They are in and around 3/4 inch.

Answered by Jacobandnickolas (expert)
57,318 answers provided

i believe it is metric because i put 3/4 on it and it is way too loose

Response from Swenson
21 questions asked

I don't have an F 150 here to check for sure. If 3/4" is loose and 5/8" is too small, 17mm is between them. Try that and let me know.

Answered by Jacobandnickolas (expert)
57,318 answers provided

maybe 7/8 was too big i know 19mm was too small for sure

Response from Swenson
21 questions asked

I can't imagine them being much bigger than that. Try a 22mm.

Answered by Jacobandnickolas (expert)
57,318 answers provided

i just wanna make sure because i have to buy it and if its wrong than i gotta go through the whole hassel of returning and rebuyin

Response from Swenson
21 questions asked

I understand. I will check to see if we have any in for service tomorrow. The manual I use doesn't give me this info. If you can tell me the standard sizes you have, for example 7/8 is too big and 3/4 is too small, I can figure it out for you. Let me know quickly because it's 1am and I need to get to bed. I'll wait for a little while longer to see if you reply.

Joe

Answered by Jacobandnickolas (expert)
57,318 answers provided

i believe 7/8 was too big and the next size smaller was too small so its between that

Response from Swenson
21 questions asked

7/8 is almost an inch. 1"= 25.4mm. I would say it should be around 22mm

Answered by Jacobandnickolas (expert)
57,318 answers provided