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Traynor YS-15P Replacement Speaker Recommendation

I just picked up an early 70's Traynor YS-15P, front ported 1x15 cabinet. I got it for a great deal but the speaker is on it's way out. I can feel a lot of rubbing when pushing the cone in and out. Surprisingly it actually sounds way better than expected as the previous Traynor cabs I've had notoriously have less-than-great Marshland speakers. Anyway, I'm looking for suggestions on replacement speakers I can use with this cab. Here are the internal measurements I took while I had the speaker out of it.

22.5" H (at the back of the cab)
22.5" W
12" D

Port is 19" wide and 3" H and slants down to the bottom of the cab with about 1.5" of a gap at the bottom of the cab.

I typically just play a four string P-Bass either in standard tuning or a full step down. I also play with a Traynor YBA-1a which is roughly 90-100w so I think I'm looking for something in the 150w range just to cover any spikes.

Anyone have any suggestions?
 
There is a bunch of science around this and it’s well worth listening to.

I have used eminence legends in 2 different but similarly-sized cabs to good effect. They are well robust enough for a 100watt head.

I also have a yba1-a but I use it for guitar.