My brother was restoring a WCS94 and needed new flaps (well, he needed new ramps, but we know that story), so I went ahead and had a batch of the flaps made and made a few extras thinking others may need them.
These are made from the original WMS engineering diagrams. Part Numbers: 01-12489 & 01-12490
You'll need to drill out the rivets on your old flaps and rivet these onto your existing ramps.
You can buy a set here for $12 + shipping: https://store.circusmaximusgames.com/products/world-cup-soccer-ramp-flap-set