I used two rubber gaskets from the hardware store to keep them centered and that works great then I tried a thick layer of silicon gasket maker. It slowed the leak BUT it definitely still drips on the passenger wiper side.
wow, I`d almost pay some one to replace mine, and I don`t even know if they leak yet .
but I remember they leaked on my 68 fastback when it was brand new. didn`t know what it was tho, back then!