Is there any trick to getting the fuel rail/injectors to go back into the manifold on a 3.4?

I took it out to swap the injectors with the ones off my LeSabre 3800II (that is totaled), but cannot get them to go back in right. I can get them started, but not fully in. I can't even see the rear one...

Do I just tighten the bolts down, and it will pop in?

Thanks!

 

So, yeah, I just re-lubed them with a thinner oil (paint thinner), and they all went in some, so I put it back together, and nothing seems to be leaking *knock on wood*.