Stavex rivets

[02VIPER ER]

I found them on amazon. They only have the 3/16" though. If you want the 1/4" Try contact Baysupply directly.

https://www.amazon.com/gp/product/B00CXLB1FC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

They came from Baysupply In famingdale NY
ACFR INDUSTRIES INC.
30 BANFI PLAZA NORTH
FARMINGDALE
NY 11735