Been looking for drop-in anchors or other similar plugs/fastening materials with an internal M8 thread that hold well in Leca/lightweight concrete. Conventional drop-in anchors tend to go straight through these light walls, so I need something that expands differently but still allows for an M8 thread.
Any tips?

(Other than anchor paste)
Alternatively, if I can find M8x150 stud bolts, preferably in a physical store, it seems difficult to find good lengths outside of Ahlsell or online stores.
It's vertical pipe clamps that need to be mounted, so nothing very heavy.