All of the wee and glee filters I have ever seen have the seal as part of the filter.I have recently changed the filter on my new to me L2 glee and it is the same one as my old K9 model.You don’t have to buy a new filter if you have access to an airline.Just wash the filter with biological washing powder in a small bowl using a soft brush, rinse it out with plenty of water and blow it out in the reverse direction to the airflow,or leave it to dry for a couple of days.Don’t buy a Suzuki filter as they are ridiculous money,I use a Hiflo HFA361 that I bought on line,and it works great.I have a spare so just change it every year and clean the old one, then put it back in the box until the next time.
Just squeeze any old oil out of the breather sponge and blast it with brake cleaner or similar, and wipe out the housing that it sits in,it has oil passing through it from the engine so doesn’t need any more oil on it.