Part help needed for rivets/pins on exhaust manifold

[weider1717]

Hi, I am having trouble finding the correct part number for the exact rivet/pin on the right side exhaust manifold for my 87.

these rivets/pins (2) go on to help hold the "heat stove" or heat guard onto the manifold.

I am restoring the manifolds and tried heating the rivets/pins up but ended up just snapping one of the heads of the rivets off and stopped there and just going to take it to a machinist to drill them out etc.

anyone know what the part number for these rivets are? I am gonna need two new ones to put the heat shields back on. They're also spot welded together front side to back side around the exhaust manifold.

thanks for any help.