Just received my new replacement valve cover, there seems to be some cracking going on on the spark plug tube seals. The pictures are attached of how they look, and was wondering if the valve cover seals are good or do I need to ask for a exchange?

Hit up who you bought it from, and if they say it's fine put some rubber protector or them and see if the cracks go away (dry rubber).

I bought it from z1motorsports, isn't there one of there representatives on this forum that maybe can take a look at the pictures and give me his opinion?

Those are just rubber, looks fine to me. Coat them with oil and slap them on. Unless it actually feels hard and brittle.