Having difficulty finding a modern kit to rebuild my Power Brake Master Cylinder, everything is for the manual. This is for my 1954 Buick Roadmaster. I did find one kit, expensive and NOS??? Thoughts on using 30-50 year old o-rings? Other good options other than shopping out the whole job? The part is in great shape so it should not take much to rebuild. Primarily I just need to disassemble it, have the booster Cad Plated and the master cleaned up for powder coating.