how to find the right parts?

Hello greetings from Denmark 

I'm trying to find some shock absorbers for my Skoda Octavia Vrs 06

I've got some original part numbers from Skoda

Front : 1T0413031HP

Back : 1K0513029GB

but when I search for these numbers on bilstein homepage, this is what i got

http://web1.carparts-cat.com/default.aspx?38=68401700&35=171&36=854&124=854&14=1&1105=1&10=58DC27991D5443F69E595E60A369EE33018001&12=140

then i took the bilstein part number and did a google search, then my car is turned into a Skoda Yeti http://bilstein.suspensiondirect.co.uk/Bilstein-Skoda-Yeti-1.2-TSI-B4-Gas-Damper-Shock-Absorber-22-183729_22440_19_2210_13788.jsp

and for the back nothing http://web1.carparts-cat.com/default.aspx?14=1&122=1&230=0&10=58DC27991D5443F69E595E60A369EE33018001&12=130  :wonder:

but if I go on the Bilstein website and try to search for my car manually to find the some shocks for my car, then there is no problem finding shock absorbers

http://web1.carparts-cat.com/default.aspx?230=1&36=0&35=171&32=19459&34=0,100121&14=1&10=58DC27991D5443F69E595E60A369EE33018001&12=130

what am I doing wrong? hope you can help me

Regards Morten