Breaking loose AC fittings?

[61_FL_Apache]

Im working on my AC system and need to replace the dryer and orifice tube.. All of these fittings look to be aluminum and are kinda frozen. I have tried PB Blaster on them, but no luck..

The fittings on the dryer are tight up against the firewall making them a little harder to get too.. The orifice tube I can get to ok, but I don't want to put too much force on them.

Any other suggestions?

Thanks for your help!