Bumper fastener spec?

[cludow]

Hello All, first time poster but long term lurker (so forgive me if this has been asked and answered earlier!). I have removed the front bumper from an XC70 to replace some bulbs and have lost one of the Torx button head screws that pull the sliders in to capture the ends of the bumper at each side. At first, I wasn’t too concerned and left it out, presuming I could find the spec easily enough…

Anyway, after hours of searching the net by me and my son, I’m throwing myself on to your tender mercy. What the heck is the spec for this fastener? And has anyone found the correct exploded diagram for a 2005 XC70 2.4 D5 T5244 163PS? It’s 30mm long, anodised black, has a washer and is captured by a U-spring nut on the sliding plastic part.

Thanks in advance!