Papaschmit

Hello all I ran across this post as I was trying to find some Info on my marshall jcm 800 lead series B cab that I got when I bought my jcm 2000 dsl 100watt head a few months ago. I could never find anything about the speakers. The cab is loaded with the celestion sidewinder S-150 speakers in it. Everything i read on internet says about these speakers comming in the jcm 800 bass series cabs. But mine is a jcm 800 lead series B cab. The only thing I found out was that the sidewinder speaker s-150 were made for guitar and the sidewinder s-250 was made for bass guitar. Marshall supposedly marketed the bass cab with both the s-150 and s-250 in a bass series cab. And also the s-150 sidewinder in a guitar can but only for like one or two years. Has anyone ever heard this and could confirm this information, or am I way off. Any info at all would be greatly appreciated. Thanks and sorry for the long post