This is spooky Maris,
VERY spooky!! Why do tou ask at this time? I have just purchased one, and have been chatting to our colleague, Barry Kirsten who has had one a while. I'm advised by tracking that mine. is a Matraville FedWx depot this morning awaiting imminent delivery.
To answer you question, YES balloon bellows are available. I believe Barry's has somee and I know mine does. Available online are both authentic fabric Linhof bag bellows and Chinese leather bag bellows.
In the early 1970s I had a job at Arnotts Biscuits shooting exclusively with three Linhof Kardan Bi- System 10x8s. The Linhof Super Kardan Color SC JBL 4x5 is a later little brother — the 'JBL' signifying Jubilee in 1979.
"We see things not as they are. We see them as we are."
— Emanuel Kant