I'm sure I paid more than that years ago when I did my L67 build. They're not as abundant as they are now. I'm also running heavier poundage ones, because at the time they were the recommended weight.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne