High humps and low humps: which way is the conversion usually done?

[Brad54]

I got to thinking about this the other day: I usually see the high hump tunnels and the firewall piece for sale, but rarely see the low-hump pieces for sale.
Did I miss it, or do most of the trans tunnel conversions go from low hump to installing a high hump?

Does the low hump clear a modern auto trans?
Why do most guys install the high humps? My suburban came with the high hump and a 4spd granny, and my k20 came with a high hump but a 3spd manual on the column.

OR, do I have it backwards, and guys install the low humps in place of the high humps?

(And while I'm at it, what year did they change from bolt-in to a welded in piece of the floor?)
-Brad
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