According to Blomberg, the buses are very rare: only 73 were made. One (No 30926) belonged to B.B. King and was delivered to him on the May 3, 1958. It was subsequently stolen in 1966.
The Shimer bus (No.30951) was delivered on June 26, 1957. Nothing more is known. If anyone has any information about the bus (how long it was owned, to whom it was sold, what it was used for), please contact firstname.lastname@example.org.