Ed,
Sorry to say that I don't have the dimensions of the longer locking lug on the "*" marked bolt.
You'd appreciate that a "*" marked bolt goes in a "*" marked receiver, and it is possible to use a non "*" marked bolt in a "*" receiver, but not possible for a "*" marked bolt to be fitted in a non "*" marked receiver?
"*" Marked (Mark 1* rifles) receivers were machined to take the longer bolt lug.
The No 2 on the receiver ring indicates the Eddystone No 2 magazine assembly. The No 2 magazine is not an interchangeable component with Remington or Winchester rifles. A No 1 magazine in a No 2 body will require adjustment to allow proper functioning of the lading from the front plate to allow the bullet to ride smoothly and unobstructed over it.