I recently purchased a 901-510 adapter from another retailer. It didn't fit...So, before I buy another, I just want to make sure that it will work. I have a Riva 901 that I want to use my 510 carto's on. Will the adapter you have work in this manner? Also, the 808-d carto's...will they work on a Riva 901 batt? Thanks for your help!!