Paul
This should not be a hard exersize, you only need an adapter which should be available at any plumbing supplier.
I found, in Australia, the general harware suppliers don't have all the right parts for jobs like this they cater to the DIY buisness, whereas a plumbing supplier carries a more specialised comprehensive range.
If your hardware supplier has a big range then maybe the can help.
remove the old hose from the 45 degree adaptor and take the old hose and new hose to the pluming supplier or remove the hose and 45 degree adaptor and take the new and old hose with adaptor to the plumbing supplier.
Ask the supplier what sort of sealan they recommend when refitting.
Job done.