Baycode you're a Godsent. was about to ask you for a link to those tips!
just to check, the photo you have of the no name foams with the senn double flanges. is the senn double flange s/m/l size? this is because the smallest no name foams are slight too big (hence the discomfort) for my ear canals and so I'm looking for a slightly smaller tip size
I can't be sure of the sizing for senns but they look like s, m, l on the ebay page.
Although my senn tips seems to me like XS, S-M and , M-L as well But if the small foams don't work for you I think small senns may work because they are made of very thin and soft silicone
You can ask the seller if they deliver sizing options before purchase...