Thanks for the replies. Called Hughes and Mancini and both said they no longer sell the SFI flexplates for 5.9s due to lack of demand but said told of a place that may have them called A&A transmission. I've been playing some phone tag with them but I'll post up what comes of it.
I just bought a new B&M flex for my motor from current SFI tag too. Had to modify the holes since I have a 8 bolt TC. I'll have to see where I bought it from, thought summit but wasn't from there