Check with Jim Salk, he can make one any size you want. I just got one that's 37" long with Seas Excel and Raal drivers.
I agree to a point with Malcolm02 that you will probably get better timbre-matching by matching your center to your mains although his reference doesn't meet your specs.
Rather look to Jim Salk, Rick Craig (Selah Audio), or Peter Noerbaek (PNB Audio) to custom build you a speaker. You can specify whatever specs you desire and can afford and get furniture-grade cabinetry to boot.