[Clan]

Originally Posted by BlueRubber

That is quite surprising if true, I was only thinking to fit it to prevent corrosion.

Found a pattern part here that looks promising:
https://www.ebay.co.uk/itm/UNDERTRAY...oAAOSwpYxcEOF5

Thanks for the informational all.

well when they first started fitting these to the last of the Volvo 140 in 1974 the lack of undertray reduced the top speed of the car from 106 mph to 98 mph work that one out :-) bolts are about 15 mm long M8 thread , best use stainless steel ones ...