Consequenses of Removing Front Cross Member Bar

Cheers to all
I removed the front cross member bar for better access to the oil pan, since I was going to work on the front cover.
I had previously removed the exhaust and intake manifolds.
Because of the weight of the cats, two things happened:
_ The Oxygen sensors cables disengaged from the connectors, see pictures below.
_ Muffler got disengaged from the front side of the system.

I need help in connecting things back together, I know I could buy new O2 sensors, which I'll soon. Would like to learn how to reconnect these.
I sincerely appreciate and thank you all for your time and knowledge.
Merry Christmas

Thank you.
Got them connected.

Knowing the Designation and where the colors go is great. Problem solved.

Designation:
Signal_________________Black
Ground_________________Grey
Heater_________________White
Heater_________________White

I hope this helps somebody in the future.