I would not think that you have much to lose other than a few days delay - if the worst happens - ie you end up being supplied with the wrong pump (ie they would say sorry and send out the correct one). I'd say if it looks the same then it is the same and if then it does not work right away then it would need its "soft code" changed using either VAG-COM or any other tool that an independant VAG specialist uses - so you would still be as mobile as you are with the current pump.
Did you look around the pump for the hints that I said would tie it down to being a TRW pump? The trouble with some of these assemblies is that they are a collection of sub-units and you might be finding the VAG P/N of these sub-units. One fact about all VAG P/N is that they are very structured in the way they are "made", the first number group in the case of this pump will be 6Q0 and the second number group will be 423, I'm a bit concerned that you found a third group that was 165 as my version of ETOS only lists 155 or 156 - but as I said it might be the P/N of a sub-unit - as long as you have checked that your current pump is TRW. Your local
Seat dealer's parts place would have printed out a "car data" listing for you and that would/should list the type of steering equipment fitted during initial assembly - that bit of paper is handy for lots of info where options or alternative suppliers may have been used at any point in your car.
Are you going to fit this yourself, if so you will need new fluid from VAG, the N/S wheel will need to be removed as will the wheel arch liner and unless you are a contortionist the front bumper and remove all the connectors. Maybe buy a new O-ring seal for the return pipe joint. I think you just remove the pump assembly complete with its mounting bracket - and swop the pumps from the mounting when its off the car. The steering system will need bled but this bit is just a case of, with the front jacked up - both sides, after filling the reservoir turn the steering slowly from end to end a dozen times - checking and adding fluid. Next fit the reservoir cap loosely and start the engine and run it at idle for 10 minutes, stop add fluid and refit cap loosely, restart engine and turn the steering side to side a dozen times, add fluid - repeat the last two steps until it needs no more fluid added - then fit the cap firmly. Remember, if you need to buy the fluid and the seal any VW
garage is just as good a source of parts as your Seat
garage.
I'd just buy a Haynes for a Polo 9N ie manual 4608 if you need all that advice.
I'm fortunate as I have not needed to mess around with the steering system yet, but I've pointed a few people in the direction of BBA-RECON since I read about them - but no one has returned to the forum (probably the Skoda one) and reported back on how "it went" - but that is usually the way, people just mainly ask questions and that thing went well they disappear - I'm sure you will report back an update us - for our future use!
