Anybody remember if headbolts are different sizes?... manual says all are 10mm -with different lengths- but mine appears to have some [4 each head] larger headed [head of bolt is size of nickel maybe?] with size of 12mm hex. Two manuals and parts lists make 10mm only claim. anybody have experience with this difference?

Thank you!

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dloveless

1984 500 SEL [131K]-
1991 GMC Sierra 4X4 XC [162K]- War Pony.
2004 Jeep Liberty Limited [8k]- wife's sled- Belle.