I replaced blades on my 930 D 72" Hopper with Stens brand blades. Not info you asked about, but have been satisfied with them. Deck belt too, and it's a whopper over 13 t long.
Thanks, but any info on GH repair, upgrade, use is great news. Keep them coming. I've only used the GH mulch blades, might try Stens when I need new blades.