I have only seen this one impact bar
but nope no holes as standardÂÂÂ

the Giveaway to haveing one fitted will be the 2 inch'ish gromet at the catch end of the door
So I'd assume it was an option since the bar is soo rare
the bar I have is from an 86/87 D plate 8 valve
I can put a pic of the bar up but it's only a bar with a bolt in either end