Rear slot for counter

Mercurio68

Recruit
Joined
Mar 6, 2019
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llSwitzerland
Hi all,
I'm trying to find a solution: I've seen on FB some rear vertical transparent slots for counter. This way the base can be used for multiple purpose and can be "updated" (step loss, DM, whatever). Unfortunately I'm unable to get back to the post, and to ask which material / piece the slot belongs from. Any suggestion?
 
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