Nylon Thumb Screws

[MRSBIGBIRD123]

Can anyone help me find these? I need to replace some and do not know where to find them. I found the screws and the wing nits but I am looking for the thumb screws.
Thanks for any help,

[txav8r]

Longhorn bolt 341-4402
alamo bolt 342-9544
United bolt 495-8665

All near the airport

[txmike]

if you dont find what you need in town try http://www.mcmaster.com/#

[jroescher]

Any auto parts store. Or hardware store that has the nut & bolt bins.

[MRSBIGBIRD123]

Thank you all who helped, my other half pointed me in the direction of Fastenal and I ordered 100 for $20 shipped.