You can get quotes from Esignal for example.
Europe is not one single market, and not all components are traded on each exchange.
Here is a starting point regarding the dow components quoting on Euronext :
NYSE symbol Euronext symbol
t atrp
mo phm
cat catr
axp amexp
dd dupp
ge gne
gm gmp
ibm ibm
mcd ma
mrk mrk
pg pgp
utx ut
Be aware that the liquidity issues, FX moves (these stocks quote on Euronext in Euros, not $) and shorting rules affect the stocks and may result in NOT giving a perfectly exact idea on where the US stock should trade. It is especially true at the open, since large orders are usually sent to the main market, popping up or down the stock significantly.
Hope this helps,
OHLC
