A little advice on wheels and rear washer please

JohnE

2005 A3 Sport 1.6 FSI
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My A3 (2005 1.6 FSI Sport) is suffering the classic rear wiper/wash issue. I've had the spurious alarm triggering, random wiper operation and catch/release issues (all diagnosed more fully with the help of excellent threads on here).

I have dried out the lock and although the washer works ok, it is also filling the motor casing with water.

I see there is a repair kit available for 45 quid or so, or I can fit a new motor for about double that. But I'm thinking it might be better to resite the washer as a separate nozzle - if I keep the water away from the motor altogether I won't be paying for another repair kit or motor in another five years or so.
What do you think?

My other question is the wheels - car came to me s/h from a non-Audi non-specialist dealer - fitted with 17" alloys wearing low profile tyres. Would my car have been available with 16" (or another size) as standard? I know it may seem a bit odd asking aboout going to smaller rims rather than larger, but I am more interested in comfort and economy than looks and handling.
 
Replace or fix the existing, resiting the nozzle would look awful anywhere else imho.

As for smaller wheels, think 17's were standard, just ask the parts depatment at dealer, with your vin, what wheel size your car is supposed to have.