I come from the live concert and studio side of loudspeaker design. If you have the original baskets for the cone speakers, and you can find a reputable recone man, many of the original recone kits are still available in back catalog. Just a few short years ago I reconed my JBL 4333’s with the original foam surround kit. Also, for the do it yourself, check out the work being done by the Italian speaker and compression drivers manufacturers B&C and 18 Sound. Precision made motors with excellent specs, cost effective as well.
Horn speakers for vintage sound
I’m currently looking for budget horn speakers in university that are similar to GIP or western electric size is no issue since it will be in the living room my budget is 5 grand if even possible or might even try build GIP speakers