Bolt head size on front brakes

[NPS]

There are two large torx bolts that hold the brake caliper to the strut base. I know they are torx headed bolts but not sure of the size. Cany anyone help?

Its a Vectra C 2004, 3.0 diesel estate.

[Richie 695]

cant remember which way round they are they are different sizes front to back on my LS they are e18 on one and e20 on the other

[glynn]

they ar eather E18 or E20

[Drinky]

E20 front E18 back

[NPS]

thanks guys that's what I needed. Great!

[NPS]

Does anyone know the difference between torx T and N series. I have T allen keys and a N socket set but not N allen keys that have a N20. The closest T is T17 or which is far too small.