Hello all can anyone give me any info on the heater element for electr. auxiliary air heater OEM part numbers specifically the last digit''


so for my 2003 BKD 2lt 16v the part number is 1K0 963 235 C.. there is also 1K0 963 235 D... 1K0 963 235 E.. 1K0 963 235 F... ALL IDENTICAL HEATERS so reading on another forum they said you have to put the same part number and if you replace it with the wrong last digit the can-bus wont recognise it.. im struggling to get a second hand one ending in C.. but there is a lot of E, D,

any help on this this 

Andy