I found the
cover.
It went like this...I got the 440-8 somewhat or maybe even just plain cannibalized...no, just somewhat...and the "belly pan" (that cover) was missing as well as the control box cover. It came with the roll-around, but the cover was missing. I was going great guns to refurbish it and Wayne had both covers...like, $80 shipped I think which is actually pretty reasonable AFAIC because the belly pan is pretty bulky you know? It had to come in a pretty big box.
So the roll-around for the 440-8 is a bit beat up...at some point last year I got a somewhat sad 440B full-track in a roll-around for like $90...no belly pan, but the roll around is a in prety good shape and it had a servo capstan...some pieces need fixed up on the roll around but those pieces happen to be good on the 440-8 roll-around so, take 'em apart and frankenstein them back together...voila, one really nice one and one very functional but so-so condition one. Haven't done the last part yet.

But I'll keep the belly pan for the "good" one as I plan on loading my 440C in it which has loads of promise...VGC...will clean up smartly.