Which full range?

A few years back I built a pair of Martello V0.10's for my wife using the FR88EX drivers. I just love the design & sound from these. Unfortunately the FR's are no longer available. The physical size of the cabinet of the martellos is just right for what I want to build. Is there currently another driver that would do justice to the same cabinet, or other driver out there with a similar size cabinet which will sound the equal or better? I have seen the FR88EX drivers sometimes on e-bay but the price is way over what I want to pay or I am wary of the seller or originating sales location.
Also is American Birch ply similar to Baltic birch?

Thanks.
 
Wow! Nothing pops up to even know if it's a valid driver. 🙁 Based on published specs, the Fe85 should in theory work with a bit of series resistance to 'fatten' it up to fill the 88's larger cab tuned lower.
 
from a quick Google search, I find this excerpt from Rockler:
With a solid wood core and beautiful birch veneers on both faces, our American Birch Plywood is suitable for a wide variety of projects, including cabinets, entertainment centers, wall panels, coffee tables, bookcases, benches, desks, shelves and more. The birch veneers are close-grained and smoothly sanded, meaning only minimal prep is required before finishing. Essentially void-free, the multiple solid wood plies boast superior screw-holding power when compared to products with an MDF or particleboard core. Use it in most applications you would use Baltic birch plywood.

so, maybe?

When i was building, the distinguishing characteristic of "genuine BB" was the higher count of thinner lamination layers as compared to standard plywoods