I believe the closest you're going to get is a DDS ENG90. It's very close but not identical profile (more mouth-flare, I believe).
I made my own for 15" variants. I would not do it again, the work investment was significant. If I were designing something from scratch I'd look VERY closely at JBL 2384 and 2453H-SL. It's a relatively affordable combo that can work with relatively simple XO and has, most importantly, truly excellent performance, with near constant directivity and low distortion.