Gwagensteve wrote: Fordem might be able to tell you if the part numbers are different, but that might be it for a comparison.
I did look at the numbers but it's not that clear of a picture.
H20a heads - R - 11101-85FA1; L - 11103-85FA2
H25a heads - R - 11101-86FA0, 11101-86FA1, 11101-86FA2, 11101-86FA4; L - 11103-86FA0, 11103-86FA2, 11103-86FA4
H27a heads - R - 11101-86FA0, 11101-86FA1, 11101-86FA2, 11101-86FA4; L - 11103-86FA2, 11103-86FA4
What do the numbers mean?
The 11101 is a right side head, the 11103 is a left side head - the last five characters usually, but not always point to a vehicle type, but, it appears to relate to the vehicle the part was first used on, so some part numbers will point to a vehicle other than the one that part is being used on - pay close attention to the last digit, notice how it changes - the parts specialist at my local dealer, who, by the way, I have total faith in, tells me that this digit can be ignored - my personal belief is that this is a "supersession" indicator - an 86FA0 part would have been replaced, for whatever reason, by an 86FA1 part, so higher numbers may be more desirable - the higher numbers are also later production. Re-designed parts will usually have a change in the first half of the part number.
Note that I say may - parts are superseded for different reasons, there may have been a quality or defect issue, or, it may just be a change of supplier, for example instead of using struts from Monroe, KYB had a better price on the equivalent part.
When all is said and done - the H27a & H25a heads appear to be the same, the H20a heads are different - they may or may not be interchangeable.
One last thing - this comparison was E24 market only - vehicles built for Australia are generally, but not always E24 - there may be other differences if the other markets were included.
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unfortunately he hasn't logged on for close to two years