Need help with part ID

[Grimm]

I recently needed to replace the crank case cover on my 93 secca II and I can't find the specific bolt and gasket located in the image on any of the diagrams for part warehouses. I also cannot use the one from the previous cover as it had to be locktighted in to prevent oil leaking after I had biffed it in some sand at the end of a friend's driveway and still needed to ride the long trek back home. Any and all help is appreciated and thank you in advance!