eBay has the front and rear windshield pumps for $5.50 shipped a piece!

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Audi BMW Windshield Washer Pump New | eBay

The strainers for the front and rear windshield pumps seem to cost less directly from your stealer and cost more on eBay than these inexpensive pumps!

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The two pumps are located next to each other facing the firewall.

The pump on the side next to the engine is for the headlight washers, if you have them. It takes a different strainer and is a different style pump.

I have a 2001 X5 4.4i.