The Supertech titanium retainer for Honda is specified for 5.5mm valve stems and the beehive SPR-H1007BE spring. Described as compatible with a 5.5mm stem and the named beehive spring, this titanium retainer matches that spring/seat combination and is offered to suit installations calling for the SPR-H1007BE pairing.
Supertech Titanium Retainer for Honda 5.5mm Stem / Beehive SPR-H1007BE