Del Sol VTEC should have a B16A motor. (It's the only pre-OBD2 US-legal B16, for that matter!)
The 5th gear is inside the transmission. Swapping it involves removing the transmission, then pulling the cover off of it, then at least partly disassembling the mainshaft and layshaft. Then you re-assemble everything with your new parts. Swapping the transmission is much simpler.
A good mechanic with experience can probably do the job in 4 hours or less. (What's "book time" on a clutch job on those? I forget, but it's just about the same time as a trans swap.) It took me several days, but I'd never even disconnected the axles before and I do work slowly.
-soD
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