This piece seems to be rare, since it really gets hammered.
I got a replacement off Ebay. Not a perfect color match, but it was the only one I saw for a while when I was looking.
Good luck, hope you find it.

I got mine from mad or bay area amusements in September. I don't remember which vendor. I'm not really sure if the color matched perfectly, I really didn't pay that close attention

You could take a crack at making your own if you don't have any luck finding one. I scanned mine for another pinsider a while back. Needs a little cleaning up with an image editor, but should suffice for the needy. Download the file in the center of the page at this link:
http://www.mediafire.com/?due8vjchq1la7zd

Is this what you need ? You can have it if you want it. I have other taxi plasics if you need any thing else. Pm me your address.

20130127_230009.jpg

I did not think of that piece. I was thinking of the one over Marilyn/Lola with the same text on it.
Seems like the Lola one is more often broken.

There is/was a few on Ebay, I just bought one a few days ago, and the seller put another one up, was from the CPR repros. It's still there...

ebay.com link: Williams TAXI Pinball Machine Carry Passengers Plastic

I think that's the same one I bought a few months ago. Like I said, it looks pretty good, but the color is not quite exact, at least to the other plastics on mine. Not sure the others are original.
Looks way better than the smashed one I had on there.

I bought the one off ebay as a spare, I had just purchased the full repro set about 2 weeks earlier. No sooner did I mention there was one for sale did it become sold in just minutes.!!!!