I have to replace both high pressure and return hoses for the power steering pump. Questions:
1. How do I find the correct hoses (dealer would be one, but these are 3 times more expensive then aftermarket) for my car?
2. are there any tricks to do it without dropping the subframe?

 

FCP Euro's website is a great option. They have a live chat where you can confirm fitment via a VIN number or you can call them. They will have Genuine volvo as well as potential OE and aftermarket options. Tasca is a discounted dealer webstore. You can also remove your hose and bring it to a hydraulic hose shop and have a new one made up. The last option is probably the cheapest, but you will not have a part as quick as the other options and maybe you don't have the means of getting to one of those stores if there is one near you.

I can't help you with question 2 though

 

Thanks!