I have used many spring bars for my Omega Planet Ocean 45mm.  These spring bars seem to be a better match for the oem rubber strap rather than the original Omega spring bars.  The spring bars are great quality and their diameter is perfect for a tight fit with the oem Omega rubber dive strap. fYI...... the 45mm Planet Ocean rubber dive strap takes 22mm spring bars. The 42mm Planet Ocean takes 20mm spring bars.