New, the top two alum flanges are 17mm apart. They are considered collapsed at 13mm.

Your 10mm x 3/8 drive socket is probably 13mm OD. Measure it and use it as a feeler gauge.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)