Which alloy wheel bolts please ??

[Doodlebug]

Just about to get some C4 alloy Resolfen back from the reverbs and finally get rid of my stock 15" steels.

I'm fully aware the original wheel bolts for my 15" steel wheels on my Berlingo will be no good and will come undone (Wrong type)

Now as i'm lead to believe i need bolts that have a flat washer, will use original citroen, but i'm confused with bolts that have a thread on the top taper under the washer or no thread on the taper at all.

Is there a difference please or can anybody advise ?

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[dumdum]

It doesn't matter they are exactly the same, probably just machined down from an m20 fine threaded bolt, the top section being smooth or threaded makes no difference, it's just metal

[Doodlebug]

Dumdum

Thanks for the reply.