No need to shout
EH Column is a bolt-up fit I'm pretty sure. One of my earlier FCs had one. It might require EH pitman and idler, not sure about that.
EK auto tunnel is the best and neatest if you want a whole new one, but they're getting awfully hard to come by these days. It's actually a lot easier to cut an H-shaped slit in your existing floor and create an enlarged tunnel than completely replace the floor and tunnel. Quite a few people have documented how they did this on the forum at various times.
Either way will probably require custom floor covering (carpet).
Hope that helps,
RET