The LH0289 DM 85513 is an HO/VHO lampholder / socket / tombstone that fits R17d base fluorescent and LED lamps. It is unshunted and has horzontal contacts. The LH0289 DM 85513 has "flexible wings" for easy insertion into the light fixture.
Link to HO, T10, 1500mA, T12 VHO, lamps that fit this socket