RB-Back on 4x5-International?

Is there an adapter to mount RB-backs on 4x5 cams/4x5 International mount?
beside my problem, which does not help me: There is M-adapter to 4x5 but for M-press 120/220.
One solution is the heavy toyo slider. available for rb and m-press.

the rb67 back is 2x3 graflok. so any adapter 4x5 to graflok 2x3 should work.