What parts you need? Pretty sure much of the drivetrain on that reel is from a Jigmaster.
I would like to know this for myself as well, I have missed out on many aftermarket parts, I do believe for the 970 and 980!
I have 6 Penn mag powers here, having two of each of the 970, 980, and 990!
I have a decent looking set that I fish, and the other set is resting up, on the shelf!
And haven’t really even played with the 990 in a while because it’s just so damn, big Lol!
I say this all the time, if you can consistently bomb a big bait way out there, using one of those big old squidder’s, or one of these giant 990 mag powers and not overrun, with these super heavy spools, you’re basically a casting god jn my eyes!
EA