I’m still not totally clear on your front pipe bolt.. please describe exactly where it goes.
These are the original part numbers for a 2014 LC.
Head to exhaust manifold stud: 90126-08052
Head to exhaust manifold nut: 94151-80841
The following numbers supersede the above in Toyota’s US system (and are what I received when I did similar work a few years ago)
Head to exhaust manifold stud: 90126-A0019
Head to exhaust manifold nut: 90178-A0048
Neither of the above parts show to be discontinued on the site I use, though they do list as incorrect for a 14 cruiser. I believe the last part to be a mistake, which does happen sometimes.
Basically, this seems like the time to reach out to their support with your VIN and describe your issue.