Draw runners-blum tandem slow close (Drybrook GL17)

Just dismantled a bed side table with these concealed runners. £8 new. Have 4, enough for two drawers.

Blum Tandem Single Extension Drawer Runner with Blumotion (part number 551H410-01B01 ), made in Austria

BLUM TANDEM single-extension (partial pull-out) concealeddrawer runner with integrated BLUMOTION soft-close

Nominal Length: 410 mm
Load Capacity: 30 kg