The heel is the small more-or-less triangular piece at the back of the landside. An adjustable heel is mounted with the bolt in a slot so the heel can be moved back/down on the landside. It mostly shows up on later plows.
For older plow bottoms, "high speed" means speeds up to 5 mph without throwing the dirt too far. Many of the older moldboard designs turned the soil too sharply and would only do a good job at lower speeds. I think the high speed bottoms started becomeing popular before steel wheels had totally lost favor. So a high speed bottom combined with steel wheels may not be real common, but probably not all that unusual.
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