LaVoce FBASS08-18 Alternative?

Hey everyone,

I'm hoping to build a pair of these speakers but I'm having a hard time locating all the parts in the US, or from places that will ship to the US. Does anyone have an alternative to the LaVoce FBASS08-18 that might be easier to find?

I'm also not set in this specific build, so if anyone might have a suggestion for a similar build with easier to source parts, that would be great as well.