Q: how to connect to 2 thunderbolt displays with macbook pro 17 inch early 2009?

Your MacBook Pro has one Mini DisplayPort and can run only one external display.  It has no Thunderbolt port, so can not run Thunderbolt displays.

https://support.apple.com/kb/SP503

The Thunderbolt display has three USB ports, one FireWire 800 port, one Ethernet port, and one Thunderbolt port.

https://support.apple.com/kb/SP642

The similar Mini DisplayPort display has only the USB ports.

https://support.apple.com/kb/SP597

There are USB display adapters

http://www.newertech.com/products/vidu3dvia.php

but performance and resolution are limited, and no Mini DisplayPort.

Here's a USB to DisplayPort adapter

http://www.startech.com/AV/USB-Video-Adapters/USB-3-to-Displayport-Video-Card-Mu lti-Monitor-Adapter-2560x1600~USB32DPPRO

Use it with a DisplayPort to Mini DisplayPort adapter.

http://www.startech.com/Cables/Audio-Video/DisplayPort/6in-DisplayPort-to-Mini-D isplayPort-Video-Cable-Adapter-Male-to-Female~DP2MDPMF6IN