wildcard foldername

Is there a way to wildcard the folder name?

v_swap1="Swap Space in GB:"
v_swap2=`awk 'NR==2{print $4*512/(1024*1024*1024)}' /opt/SUNWexplo/output/explorer.zeus/disks/swap-l.out`
echo $v_swap1 $v_swap2

Actually under /opt/SUNWexplo/output
I have 2 explorer with their tar.gz format. For example,

explorer.zeus1
explorer.zeus2
explorer.zeus1.tar.gz
explorer.zeus2.tar.gz

I want to access either explorer.zeus1 or explorer.zeus2 (the real names are:
explorer.05e32374.zeus-2008.02.29.23.30 and explorer.08630c21.zeus-2007.06.08.22.30)

how to do that?
thanks

let me rephrase please my question:

under /opt/SUNWexplo/output, I have 2 folders and their correspondent tar.gz files.
How to cd one of these folders (and not their tar.gz) assuming that their name is not known.

thanks