Ultegra 6800 chainring bolts and covers

Hello,
last time I lost one of chaingring bolt and cover - really don't know why, looks like it was not tight enough.
Now looking for new and... WTF, original parts price are amazing.
Is there any replacement for this? It's M8x10.1
last time I lost one of chaingring bolt and cover - really don't know why, looks like it was not tight enough.
Now looking for new and... WTF, original parts price are amazing.
Is there any replacement for this? It's M8x10.1
0
Posts
https://www.bike-components.de/en/Shimano/FC-6800-4-arm-Ultegra-Chainring-Bolts-36-46-t-p48686/grey-2-speed-o1302393/
4 bolts = maybe €2, maybe not.
Covers? It's strange for me, 5-bolts systems don't have such problems