While I do slide them back into place, I simply pull the seals out of the channels. I get the top started and they pull rather easily out of the channels. Much quicker than trying to slide them out.
To reinstall all rubber seals, I use temporary rubber lubricant it makes the job so much easier/quicker and it is safe to use on rubber.
P-80 Rubber LubricantYou may be able to get a free sample bottle from them. It works amazingly well. If you ever fought putting the rubber seals back in, you will not believe this stuff.
Good luck to you.