Strut mounting bolt size for strut bar?

[82eye]

i've got some strut bars to install but there is zero chance the existing strut mount bolts will work. does anyone know what size the strut mount bolts are? i'll have to pick up 8 longer ones.

edit: see it's m8 x 18mm. follow up question : the original is a lock pin and not a bolt per se. has anyone replaced these with a bolt to mount a strut bar?
i'm wondering if replacing the original is not advised. i've been doing some searching but i'm not getting answers directly related. i know this has to have been covered at length.

[82eye]

my edit didn't show up.
found the size is m8 x 18 but it is a lock pin not a bolt per se. not sure if knocking it out for a bolt is a non starter. i'm sure this has been covered, can't find it in the searches, getting answers for other things.

[digger]

you could replace them with longer bolt and tack them into position to make it easier to install