Thermostat part number?

Anyone know the part number for a 1989 GTA turbo thermostat? I have replaced mine with a uniy from GSF but it's still not warming up properly and having spoken to JohnK he tells me there is something a little different about them so I need to order a genuine Renault stat.

Trevor.

I bought a thermostat for my GTA about 18 months ago. I didn't have the part number either but you can just give him your chassis number, which I didn't have to hand at the time either, so just told him it was for a D501 and they only list one thermostat for the GTA anyway. It cost me around £32 at the time, probably a bit more now, no doubt.

Been into Renault todatpy and ordered the stat. Circa £34 and on back order so will see how
Ing it takes to arrive.

Trevor.