No i haven't bought any tubular manifold off ebay for the 5 or even fitted it to a 5, i got a price on one off ebay for someone once but thats about it.
I personally don't like the ones on ebay, there not better then standard manifold
No you can't fit a 1.4 gtt manifold to a volvo 480 turbo engine, there not same shape close to fitting.