Quick update for anyone else who may have my same question in the future:
I did have to shave down the rails as Karl suggested.
Before I did this the barrel extension would not travel fully into the frame.
I had to remove more than expected and it was not something I enjoyed doing!
So the answer to my original question is:
A 1906 receiver can be made to fit but if you have the option it is best to go with a 1908 spec part.
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