The u-shaped assembly line balancing problem (UALBP) differs from SALBP only by a different interpretation of precedence constraints. So, the SALBP data sets can be applied for testing algorithms for UALBP, too.
Here you can download some results of UALBP-1 (for the old SALBP-1 data sets) obtained by ULINO as described in Scholl and Klein (1999).
Scholl, A.; Klein, R. (1999): ULINO: Optimally balancing U-shaped JIT assembly lines. International Journal of Production Research 37, 721-736.