All - just installed the zone UCA with Bilstien at 2.1... was poking around, still have a very random clunk and noticed how close the UCA is the upper mount.. called Zone and they weren't much help but at least I verified I have them on the correct sides part number 02547 is on the driver side and 02548 is on the pass. there is clearance but not more than a couple of mm from UCA for flange.... anyone else notice this?