New servo pump

Moin Moin dear community ;-)

I'll start from the beginning ;-)
I've been losing hydraulic oil for a long time. I was able to locate the site very well... It dripped directly behind the holder of the servo pump onto the air-conditioning compressor or. on the oil pan and then on the good ground. On the weekend I went to work and expanded the good piece... Was actually not so bad, if you follow the repair guide. So now to my actual question. I was at a Bosch service in Hanover this morning with my dripping pump... The man at the counter shook his head and said, "Sorry, we don't do that." Hmm... All right... Then I asked Mr. Google and there I found then actually only servo pumps, which one in exchange for approx. 150€ can be purchased..... Now I'm with this one http://www.autoteile.net/shop/detail/servo pump%2C+Lenkung+Audi+V8+44_%2C+4C_/AUDI/V8+%2844_%2C+4C_%29/C22/S07B410-_-12 and wanted to ask in the round, if that is good, or if you should rather leave your fingers of such a thing?! In addition, I would like to join the 3 hollow screws + sealing rings of the 3 cables... Can somebody tell me where I can get the stuff?
LG Kalli ;-)