Simon,
Are the M47 and M90 Guibo connections exactly the same? I posted pics of my M90 front halve propshaft for the OP in the M90 thread...measured 744mm (from memory). What I don't know for a fact is if all Guibo inputs are the SAME dimensionally. I don't have an M47 front half to measure.
Here's my M90 front half shaft:
[IMG]
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Another solution that hasn't been discussed in this this thread.....beg a Euro TBer to buy and ship the OP the piece he needs.....and done.
No cutting, welding, balancing required.