[wwwd]

I've got to sort out a website for my mate and he wants to sell tyres online - but there's loads of different sizes and specifications, like these examples below:

www (dot) blackcircles (dot) com
www (dot) tyrexpress (dot) com
www (dot) national (dot) co (dot) uk

Now you'll see the same system, drop down boxes and then you get the results you need - then you can buy online.

My web design/programming is limited to OSCommerce - is there anything else which is Open Source and does this or am I stuck?

And if not where would I start to do a system like the examples above?

Any help would be appreciated!