That's sure different. I'll make an assumption your BL22 is not drilled and tapped for mounts but has the 3/8" dovetail?
Apparently this mount/base is proprietary to this line of scopes. They made one for tapped receivers and one for grooved receivers. I bought a second scope with the mount I need and will sell the other.
If that plate can be removed, Tip-off rimfire mounts for 1" scope tubes are sold almost everywhere. Wallyworld sells Weavers.