Or just don't use an additive at all, and don't worry about it. Its pure internet fallacy that Ultra Low Sulphur diesel kills pumps and wrecks engines. All fuel companies have added lubricity agents to their fuel mixes to make up for the lubricants burned off when the sulphur is burned off.
We've been ultra low sulphur up in Canuckville for a couple more years than you guys have been, yet we haven't seen any additional fuel pump failures, nor has there been any tendency for older diesels to run poorer. About the only thing we ever noticed is that older tractors ended up having to go through a couple sets of fuel filters on the first tank as the higher detergent ULSD washed some of the crap out of their lines.
Also bear in mind that very few additives actually work as advertised. In another thread, I'll post a research paper done down in the US of some of the more popular fuel additives. Only 12 out of 20 actually improved RAW diesel fuel (not pump diesel, but rather pre-additive fuel), and only 2 of those actually improved lubricity to an extent that would be significant (according to engine manfacturers).
Rod