DPG, Brk-Int may have your best option. Having new springs made will likely cost about the same as buying replacements if available.
If you happen to have a photo of the entire unit and any possible markings (manufacturer, model, anything) I may be able to help you locate a replacement, if not the above will be just as easy.
Grady, a bulkhead is a cluster of toilets arranged for optimum choice when such a service is needed.
