I have recently purchased a Bassman silverface with the AB165 circuitry (well, according to the sticker). With it came an fender 2x15 cabinet. The seller thought the speakers inside had been replaced with peaveys. Inspection of inside suggests to me replacement, however ther are no sticker labels identifying the speakers. One seems older than the other. They only have some printed numbers on the back of the speakers. These are what looks to be SPL-1 with a second number of 67-8110 and SP-1 with a second number of 67-8130. they are all black. They seem voiced for bass. Any help with identification would be appreciated.