Heckel bocals are very good also Fox & Puchner. Benson Bell in Canada makes a variety of styles one of which might work for you. Certain models can work well with older instruments. It is very much a question of trying a few & see what suits you - this, like reeds, is very much a personal thing.
Heckel and Leitzinger bocals are usually my two go to brands for top notch quality bocals. Foxes tend to play better on Leitzingers than Heckels.
Forrests music sells leitzinger and Heckel bocals. Edmund Neilsen wood winds has a large stock of Heckels.
Thanks for the recommendations. I have a number of Fox vocals (CVC/CVX). I have a CV #2 which I and others have found best on my pre WWI Kohlert. Unfortunately Fox no longer makes this model. I have a Heckel VCD #0 which has a nice upper register but poor lower. For a hobbyist Heckel vocals have become just too expensive. But here's something that might narrow down choices. Keith Bowen says the instrument plays much like a 5000 series Heckel. Any thoughts?