[Typo3-shop] Howto show a SINGLE product?

[redacted name]

Hello!

I have a SINGLE and a LIST instance of the plugin tt_products on one 
page. Default the SINGLE instance is showing nothing, when clicking on 
one product in LIST its shown above in SINGLE.

Have a look here:
http://www.volarte.at/Serie_Cuadros.223.0.html


Howto show initially one product when calling the above adress?

I tried with the pagetype 'External Url' and put inside url 
'www.volarte.at/index.php?id=223&backPID=223&tt_products=41' BUT this 
doesn't function (infinite calls)

Does anybody knows a solution without too much source-fiddling?

Thanks,
Tim