Hi Cutegargoyle, welcome to our forum. Nice to hear that even in the UK Tomos is present. Forgive me if I make mistakes in typo, because it's not my native language and I have to write this message with help of Google translate. Ik hope it's ok and you understand what I mean.
To answer your questions, I expect that you have used the form on their site? I normally use the direct email address from Tomos Netherlands : firstname.lastname@example.org
, but that's no guarantee you get your answers sooner. You can try to send it there. Of course, because of the Dutch holidays, it's not uncommon you don't get an answer immediately. Please have some patience. For as far as I know, they don't sell parts/ spares. You need to go to the local reseller or try finding online if someone is selling second hand parts. Maybe you can order on the Dutch sites mentioned on the forum. Please keep in mind that there might be some extra costs for shipping and handling.
Maybe it's possible to re-chrome the wheels? On every show on the Discovery Channel I see that in the UK there are many businesses that do refurbishing (e.g. classic car details).
I assume that the wheels of the 45 Classic will fit, the rim diameter must be the same as every other "classic" Tomos model of that kind (except for the front wheel of the Revival model, that one is 17") . But you can go to you local reseller to see and measure if there are any major differences. On the site you mentioned they have under the tab "Support" a PDF file of spare parts of the classic XL. As far as I have seen in this spare parts manual there are no differences between the "oldskool" models and the new Classic XL.