[turner]

My M88 wears an M8 4X Leupold now and there's plenty of clearance for it. The M8 does have a pretty long tube though. Before that it had a low power Nikon with 20mm objective and it worked well with it too.

Midway also lists a base by EGW that's a picatinny style with several slots for rings.

Hope you've got it figured out!