Yeah I don't care for the reissue Jensen P10Rs either I have replaced them in all of my fenders that came with them. I will run it with my Aracom if I want to crank it up.Be careful with those speakers. While they are one of the best sounding 10" speakers I've ever heard, they will get destroyed if you crank that amp through them.
I had a Vibrolux Custom that had two of those speakers from the factory. Blew them up the first timen I practiced bwith the band. Blew up their warranty replacements as well. I never like the Jensens that Fender changed over to.
I'm sure that the warranty claims were the reason that Fender stopped using them. Just be forewarned that Eminence is still producing blue framed alnicos, but they do not sound as great by any means. They utilize a kapton voice coil rather than paper, and that's the difference. They won't blow up, but once you play the first version, you won't be satisfied with anything else.
I also have a Zinky RI Brownface '63 Vibroverb.Another Bruce Zinky Fender amps?