Advice needed - Where to buy replacement foam??

I'm brand new to kayaking and bought an Outback for fishing. Long story short, I had no idea I needed those foam blocks that came inside the kayak and ended up throwing them away. Is there any place I can go to buy a replacement? Are these for stability as well as floatation? I'm just wondering if I compromised the integrity by not having them in place. Thanks.

for flotation you can buy pool noodles...for the black foam blocks you may be able to use EPP foam...I would contact a dealer or Hobie and see if they can send you some...I "believe" they also add some support so the upper deck does not sag in the heat or while seated and on the water