Esteemed Gentlefolk,

I'm looking for sources for the following items.

1) Arca Swiss mount rails that the cleat blocks attach to. These rails are under each standard (fore and aft). Alternative sources (if the OEM doesn't sell such things), perhaps without needing machining?

2) Deardorff spring metal tabs that hold ground glass backs in place. I'm looking for someone who may have already fabricated pieces or has NOS. I need the parts that cradle the back at the bottom of the standard as well as the spring tabs at the top of the standard.

3) New synthetic material bellows - built to spec.

Resources? Comments? Feedback?