Ok thanks for your answers.
So, basically none of the local shops can order the 3015s or the Faitals. The repair shop says they have an EV of the same series as the 15BX and that the resonance frequency, the size and don't know what else fits perfectly well with my cab and the other speaker. I asked for the exact model name but the guy said he had to unmount it and blablabla. I can still call him again and ask for the model. He charges me 150$ total, including the mounting and unmounting of the broken speaker.
I found a pair of Faitals for 500$ shipped, but that's like 660$ Canadian dollars, which is a lot of money. I'm still tempted to buy them and have a killer cab, but 150$ for a functional cab seems fair too. Once again I mumble.