Hi! I'm a new member in search of a needle in a haystack. I have a highly customized 1992 London Taxi that has DS420 door handles -- the kind with the round push button, no keyhole. Am looking for the internal locking mechanism for the right front door, which I believe is part #BD31361. Can anyone assist? Have found a few similar parts on eBay but not the one I need.

Thanks very much!