Weird turbo parts: where do these go?

[kapnklug]

I'm installing a turbo setup from a '93 K3500 on my M1009, and the parts box has these in it -- I think they are heat shields for the glow plug wires, but I can't figure out what they bolt to. And why do I have only 2? Anybody seen these?

 

[Stonepicker1]

Look at post # 15 the sixth picture. You are correct. Mounts on exhaust bolts.

http://www.steelsoldiers.com/cucv/62434-cucv-ii-south-florida-rebuild.html?highlight=cucv-ii