Mr David

Dometic RMDT8505 Prod # 00921087568

The cooling units for these fridge/freezers have been discontinued BUT there is an exact equivalent available from Dometic. This equivalent cooling unit requires a different gas burner and gas pipe.

2890352400 Cooling unit
2890604917 Gas burner incl jet
2412593986 Gas pipe

The cheapest and very much the quickest source of these spares is from DMS, who advertise on MHF.
For me, they ordered it direct from Dometic in the Netherlands, it was delivered direct to me in the UK and arrived within 3 working days. It came direct from Domestic in Germany.