I think "period correct" is a relatively recent thing. Prior to the '80s, period correct was anything that kept your bike going. If I used house paint and a brush to paint my Indian, it would be period correct. Oh...I just remembered- you have a BMW. That's completely different. I'll never forget I was at some stinky little ralley and some guy sidles up to me; "That your R69S over there?" (he looks off in the distance, not at the bike) Yeah...?
"You do know those aren't the correct front fender brace bolts, right?" Yaaaaaaaaaa !