Missing heat riser

[jame]

Finially looked at the passenger side exhaust leak Ive had since I brought it home. Took a minute but realized some one has removed the heat riser. The studs are way to long to tighten up and I see no way a donut could seal in the manifold opening even if shorter studs were installed. Is the only option to buy a new heat riser or can what I have be made to work. Hate to spend so much on a part when I would not use its actual function anyway. It would just be a spacer at this point. Should have added this in on a 78 k20 with a little 400