Finally got around to swapping in seats. The old ones were both broken...the backs wouldn’t lock and they looked silly.
I happened to have a set of 2nd row captains chairs from a 2000 GMC Savana conversion van. I removed the tall pedestal from them and mounted the bottom plate to the old swivels. They sit a few inches lower but I think I could raise them if I need/want to. So comfy!