Philip,
Sorry for late response – if it is not too late I would recommend the original scroll – especially if you can remove the flywheel for access. This will allow you to ensure centralisation – very important – as well as allowing you to get at the fixings.
I would also suggest fitting a new one if possible because they do usually get distorted once fitted. (And, yes, I may even have one and will look if you are interested).
B.…………….
Bernie