Hi Mel,
There are many places where this conversion can be carried out, if you can find your way to the 'Saniye' opposite the new coach station, you can probably enquire at one of the OFFICIAL vehicle workshops there. That is, Fiat, Renault etc., not the grubby little sheds that carry out normal repairs .
Years ago, I used to sell, in Scotland, the Landi:Hartog conversions, and it was very successful, but our workshops were as cleana as a hospital surgery, meticulously clean, as it is an extremeley high pressure system, every single part of the process has to carried out in an almost surgical manner.
By the way, there is also a rather hefty tax to pay upon completion of the conversion.
Not meaning to put you off of what is a cheaper way to run your car, good luck.
Gordy.