I picked up a TMNT 4-player to follow along with John's restore. ;)
It's missing a speaker, which I didn't think was any big 

 but I'm having a hard time finding something that isn't overkill.  I'm assuming I need a 6.5" circular speaker.  Manual indicates 8ohm/6W or 4ohm/12W will work.  I'm finding a lot of smaller speakers, like 4", but the 6.5" stuff tends to be more $30+ 50W speakers.
So... anyone know of a good source for speakers?  Surely this shouldn't cost more than $10?
Another not so technical question that isn't necessarily TMNT specific:
Are magic erasers safe to use on marquee art?  My TMNT must have sat in a smoke filled bar for 30 years because it's *drenched* in a nasty coating of smoke and nicotine.  I used a magic eraser on the control panel and it whitened right up.  I used it a little on the side art and did damage.  I anticipated that and the side art is pretty chewed up so it's not a huge 

, but was surprised how much ink came off.  But the marquee placard looks really nice *except* its yellowed all to hell and *reeks*.  I cleaned it with simple green which helped the smell but the yellowing remained.  I really want to take a magic eraser to it hoping that it'll clean up like the control panel, but if it's going to wreck the artwork I guess I'd like to try something else.