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Ford has replaced the AWSF 1/2 threaded series of plugs with the AGSF full threaded series of plugs. Other than the 1/2 versus the full thread, there is no difference. The plugs are the same length.
All other suppliers of spark plugs did this years ago. If your original plugs were AWSF22, the replacements will be AGSF22. The suffix (charachters after the 22) just denote the electrode type and may not match between the AWSF and AGSF series, but they will fit and work properly.
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