First time posting and looking for help. I just purchased a 1963 Series IIa 109 and completed replacing the damaged radiator. While I was at it I tried to replace the non functioning thermostat but found that the replacement from RN does not fit the upper housing. The thermostat is the bellows type with a nearly flat top (marked: AC TF1). RN no longer has these or the newer upper thermostat housing? Does anyone know where I can pick up either part?