cool thanks for the clarification.  this is something i have not run
across before.  the numbers can be cut into their parts so i figured that
the letters could also because that is what i had been told in the past.

jonathan

On Mon, 9 Oct 2006, Mark Drillock wrote:

> Not exactly. I am saying that 2 parts with the same number may be totally
> different and only the letter after the number tells what application one or
> the other fits.  An example of this is 1986 Vanagon gas tanks.
>
> 251 201 075AA   Syncro, rear mount, 18 gal, plastic
> 251 201 075AH   2WD, front mount, 16 gal, metal
>
> Same part NUMBERS, different suffix letters. One is in no way a redesigned or
> improved version of the other, they are for different applications. While in
> many cases a merely  updated part gets a different letter, that is by no
> means the definition of a different letter.
>
> Mark
>
>
>
> Jonathan Farrugia wrote:
>
>> just for clarification you are saying that the parts are improved versions
>> and physically different, not that the letter after the part number does
>> not indicate an improved or redesigned version right?
>>
>> so on these three different filler tubes are all three still available from
>> the dealer?  if only one version is stocked by vw does etka tell you all
>> the other additional parts you need to make it work in an earlier van?
>>
>> any ideas on the differences in the ecu numbers that the original poster
>> posted?
>>
>> jonathan
>>
>> On Mon, 9 Oct 2006, Mark Drillock wrote:
>>
>>> There are lots of examples where this is not the case. VW parts with
>>> only a different letter suffix may not be at all compatible or
>>> interchangeable, even if only one letter off.
>>>
>>> A Vanagon gas tank seal for filler tube comes to mind. There are 3
>>> listed for 2wd.
>>>
>>> 251 201 139
>>> 251 201 139A
>>> 251 201 139B
>>>
>>> Good luck replacing any of the 3 with either of the other 2.
>>>
>>> Mark
>>>
>>> Jonathan Farrugia wrote:
>>>
>>>> when vw improves or modifies the original part they add a letter to the
>>>> end starting with A and working up for every revision.  all of the parts
>>>> should work reasonably the same.
>>>>
>>>> jonathan
>>>>
>>>> On Sun, 8 Oct 2006, Jeff Oxroad wrote:
>>>>
>>>>> Here's one for you in the advanced class.
>>>>>
>>>>> Half price at the Pick and Pull today in Sunland,CA (near LA). Only one
>>>>> Vanagon passenger Van. I grabbed an ECU off the 84. The part number on
>>>>> it is
>>>>> 025-906-021C.
>>>>>
>>>>> ETKA list the ECU for my 83.5 as 025-906-021.
>>>>>
>>>>> .............
>>>
>>>
>>>
>>>
>>
>
>
>