Been working on various age and brand vehicles since the 50s. The relation radiator to engine is not precise for many reasons. When the hoses are replaced slight trimming is often necessary.
Not defending a part that's labled concours correct. Any repro part is just that, a repro part! My point is it's entirely possible for this to happen with a factory dealer service hose for your Lexus!
My '64 1/2 vert. Ordered May '64. D code 4 speed, handling package, caspian blue, accent group, Ford blue manual top.
'68 vert. driver. Owned since Apr '78. C code AT, AC, PS, P disc B, PT lime gold, standard black interior and top. NOS RF fender and left quarter.New top and folding glass.