Exhaust Crossover pipe nuts on 3.4L

I was trying to tighten down the nuts on the crossover pipe on the drivers side. I have an exhaust leak between the crossover pipe and exhaust manifold and found at least one of the nuts loose. What's the best way to get to the nuts? I can only get to the outer nut with a 17mm wrench, but I can't get it tight with the wrench. I can't get a shallow or deep socket on the nut. I can't get to the inner or lower nuts with the wrench or sockets that I have. What do I need to get to be able to tighten down the nuts?

 

Just curious as the nuts on mine are the stainless lock nuts M10x1.25 I buy from Toyota taking a 14mm socket/ wrench

I can get to the left side with a long extension from underneath I can get all 3 nuts with some moving around

I can understand if the wrong hardware is being used where it could be a pain.

 

I'll try to see if I can reach them from underneath. it's possible that the nuts are not OEM. I had the head gaskets replaced over a year and a half, ago and the Mechanic was horrible.