I have a TELMA unit for sale. This is a larger unit ( C-8770 12Volt) and is suitable for even the largest buses.
I spoke with the TELMA folks in Chicago and replacement cost is over $11K. I bought this to install on my Freightliner
straight truck (Expeditor) but for financial reasons (road use taxes are a killer) have decided to sell it instead.
My loss is your gain.
I may be contacted at firstname.lastname@example.org