New speakers for Merlin TSM

Hi,

I have purchased recently a good pair of Merlin TSM (first version I suppose) and i would like to replace tweeter (Morel mdt30) and Woofer (Morel M164) with a more recent components.
This kind of replacement is an official upgrade from Merlin, but I live in Italy and for me is too expansive to send my speakers in US.

I need your help because I don't know exactly the code for right speakers used in TSM: is the new tweeter the model MDT30 or MDT30S? Woofer (MW164) is an 8 ohm or 4 ohm model?

Thanks for your help, and if you have some solution for my problem please write me!

Thanks again (and sorry for my english...)

Massimo

Trieste- ITALY -