I've never posted here before, so if this is in the wrong place I apologise!
My brother has spent a long time making a custom 1950's neighbourhood complete with custom townies wearing historically appropriate clothing and old-fashioned names. He's managed to replace the cars that you see in the neighbourhood view and has downloaded some lovely vintage cars. However neither of us have managed to find anything on how to replace the service vehicles (taxis, the maids' car etc) with these custom cars. We've both googled and searched on here for ages and have come up with nothing. Does anyone know where we can find a tutorial for this? Thank-you.

There's some default replacements already available. Maybe one of those is what you're looking for, or by looking at one you can figure out how to make your own?

I can't find anything suitable on here (unless I'm having a search fail). My brother found one unsuitable replacer where someone asked how it was done in the thread, but there was no answer to it. I'll have to try a few other sites for him.

Still no luck.

You would be better off posting here:
http://www.modthesims.info/forumdisplay.php?f=8
As that is where all of the modders frequent!

This forum is for dealing with game problems.