T&D Rocker bolt question

[sssammm]

I need to change the 30 bolts that fix my rockers to the rails, they are 12 point bolts, they seem to have gone a bit brittle, 2 snapped off when torquing, they seem to be out of stock here, I can get the same high tensile bolts but with an allen key head, its not a problem for me to change, but would you think its ok to do?

sam