In this photo taken at Port Kembla, Australia in 1967 can be seen the "BROHOLM" and a USSCO older "slow green" (to left of picture)of the KAITOKE class.
This link is about the BROHOLM http://kommandobryggan.se/sallast/vretaholm.htm
Brostroms put some of their old ships in their tramp company, Red AB Timex, and they gave them names beginning with Bro. These three were not really sisters but most of the Brostrom ships of that time were very much alike and the name could appear on different ships.
For example; one Broriver were the former Naboland, Swedish Orient Line, that sunk a Turkish submarine and another was Maltesholm, Swedish American Line.
All the best!
Wilhelmsen are also close to Swedish company Wallenius in the car shipping business. I myself have a close relationship in Australia were an old aussie shipmate still run around the coast in his tug/ferry business.
Internet is an amazing thing connecting people, just like the sea.