Yes they come separately and for your location, SLS will probably be the easiest to get them from. I have just done the same thing and also fitted new front top to window seal as well, also available from Buds or SLS. I did both the Hard Top and Soft top seals, one with OEM and one Repro. It does not appear to make any difference. I have tried both tops on the car and they seal just fine.
My side window seals were already done at some time earlier so they are the other seals you may look at if they are perished.
Garry