Riv-nuts are by far the best for this if you want to be able to remove easily

I re-riveted mine on as per OE with alloy pop-rivets,as I've got no plans to ever remove them and TBH the alloy rivets are easy to drill out anyway

Plastic scrivets won't be strong enough IMO

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Red GTB1756 powered Fabia VRS daily driver,LBSC Gti6 eater........

Mac1 ZR R1 kit car build in progress.

At Kev's suggestion I've decided to use rivnuts. I too want to be able to remove the skirts in future. The holes in the sills are 6mm so by my measurements the 6mm external diameter rivnuts that take M4 bolts will be the ones I'll use, and I'll use stainless for minimal corrosion probs and the ribbed ones to minimise the turning-in-the-hole problem. . I'll use M4 bolts with a big head to spread the load as the skirt holes are slotted to allow for fit.

Before I put the rivnuts in I'm going to use the 6mm holes to spray in Dynax S50 cavity wax. I'll also spray clear Dynax UC on the exterior of the sill before I put the skirts on.

That way I can remove them every couple of years to hose the salty mud out.

For a rivnut tool the pop rivet looking ones are pants appparently. But I've seen on the tube of you that if you get a flat steel plate and drill the bolt-sized hole through it you can use a long bolt and nut to set up the rivnuts rather than paying £20 - £100 for a tool.

Don't quote me on the detail of any of this, my calculations could be wrong!

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Cherry Rallye SOLD