Replacement dust caps & cabinets

Hi there.

I've come accross some "vintage" Bose speakers that have seen better days. I can't find a model number on them anywhere, but then they look older than I am.

They sound pretty good considering their age and condition, the drivers and cones are in good condition, but one of the dust caps is missing and the other is heavily damaged. I know they don't make much difference to the sound quality, but I would like to replace them for aesthetic reasons. Could anyone recommend a shop in the UK where I could buy replacements, and perhaps recommend a type of glue i should use?

Also if anyone has a link to a good tutorial on building your own cabinets, I'd love to do that when I find the time, as these ones are pretty knackered.

Thanks a lot!