I saw it at lunch although I didn't open either clip. I've done a little quick study on them. Only two actual cars were built by Mclaren but several, perhaps 27 replicas were built.
To quote:
With barely two years until that fateful June day in 1970 when Bruce lost control of one of his CanAm cars at Goodwood, it was no surprise that the M6GT project was still-born. In fact, only two cars ever made it off the production line; one was Bruce's own works prototype OBH 500H, now in the USA. The other was sold to British enthusiast David Prophet. Despite the rarity of the original M6GTs, half a dozen 'replicas' exist around the world.
Enter Nigel Hulme. A vintage car racer with a definite feel for big bangers – he has raced in Lola's fearsome T70 and AC's equally evil Cobra for many years – Nigel decided to lovingly replicate the M6GT in a style of which, he believes, Bruce would definitely approve.
"I think 'replica' is a misused word," says Hulme. "It really is a recreation of Bruce's first GT. We used the same recipe."
How did he decide on the ingredients?
"Well, it was Trojan, the firm responsible for producing McLaren's customer racing cars, that started the ball rolling. It offered a customer version of Bruce's successful M6 works race car; anyone who wanted to race the M6 in a private capacity could do so, thanks to Trojan. There were 28 of these cars, codenamed M6B, built as rolling chassis ready to accept a Chevrolet V8 or whatever engine the customer wanted."