Replacement for armrest holding pin?

I drive a 2019 Kenworth T680 and the holding pin for the driver's right armrest has sheered off. I suspect the previous driver to operate was putting too much weight on it too frequently. I'd like to replace it myself since it's a simple and easy to fix issue, but I can't seem to find any websites that sells chair components. If anyone knows where I could by a replacement part, I'd really appreciate that.
Here's a photo of the damaged part:

 

Thanks for the response. I was planning to do that if I couldn't find an identical replacement.

 

Thank you for the response. I'm fairly new to trucking and I'm not sure what the manufacturer for my chair is. The mill shop idea is a good one; hopefully, it's not too expensive.