GTI Front spoiler duckbill splitter fixings required.

I need some fixings for the front spoiler on an '83 GTI. The spoiler was removed when I bought the car and so far I'm having no joy finding some replacement fittings.
Can somebody please advise on what I need.
Thanks.
Matt.

Mine got knocked off so many times when it was a daily driver that I just secured it with bolts and oversized washers one on the plastic side where the bolt went through and then the other against the valance and then secured the nuts tight.

25 years later still not fell off.

http://www.ebay.co.uk/ulk/itm/270626572087

Used the fittings above and found they kept falling out and only needed a small tap to pop out and drop off. Decided to use a nut and bolt with washer method as above, not had a single issue.