Des Plaines / O Scale America has the style of grab (in brass) that I think you are looking for. Presumably available through Des Plaines if the parts are in stock. Or currently listed on the P&D website, which in my experience means they are in stock. By the way, on the P&D site, O Scale America parts are found under the Custom Finishing parts tab, as Custom Finishing was the original manufacturer.
I would normally buy from P&D versus Des Plaines when possible, as I have been charged the full flat rate shipping by Des Plaines for a small package of detail parts, whereas P&D has adjusted their flat rate to reflect the substantially lower cost of shipping small parts. Also, with the addition of photos to the P&D website, it is now much easier to identify parts.
Jim