Bravo 1 transom assembly carriage bolts
 

I am in the process of installing a new (to me) transom assembly on a powerquest. I found out that the bottom carriage bolts are actually aluminum and comes in a kit with anodes. I purchased the kit and everything looks great except I do not have the nuts and washers. Does anyone know if these are aluminum as well? And where I could possibly get them? Thanks in advance!