Bolt holes egged out to fit another application? Wouldn't be worried about it unless its a show peice or sealing surface is compromised, flange nut or decent lock washer will hold it fine
Lol yeah if its the one on market place for $99 someone had that on an import with boost.. Sealing shouldn't be an issue just use flanged hardware, dont know anyone running a egr / coolant spacer with an 85 so sealing just the bore is not going to be an issue