tapping e50 cylinder stud holes to m7

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i unfortunately stripped out a hole where the cylinder stud bolts into on my e50. i've tapped it to m7 now, but am having trouble fitting a m7 stud through my cylinder/head. my buddy as a garrelli, and i tried using one of his studs, and it wouldn't fit through my cylinder or head. treats has a few options:

this first one seem to have pretty piss poor reviews, so i feel like i should stay away from it:

M6 to M7 Cylinder Studs

this one seems more promising for what i need, and seemingly more reliable:

Tomos M6 to M7 studs

SO.

here lies my question(s):

will either of these even fit through my cylinder/head?

will the length of the tomos studs be a problem when reassembling everything?

is drilling the holes in the cylinder/head to be a bit wider a bad idea?

if anyone has had to tap an e50 from m6 to m7, i would love to hear how you solved this issue. the first link is an appropriate length, but i'm weary after reading the reviews. the second, i'm concerned about the length being too long. above everything, i'm concerned the diameter for both is too wide.

plz halp.

:<

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