Replace a surround>??

diyAudio Member
Joined 2007
I have a pair of 15" woofers on the shelf with a disappearing folded paper surround. It seems that they have disintegrated in a very short time after putting to one side.
They are cheap drivers and not worth paying $200- to repair but a replacement foam surround is $50- for the pair.
Two questions; how difficult is it to replace a surround if I leave the spider in place and does replacing a paper surround with a foam change much?
Speakers are from Jaycar and I bought them about 20 years ago and they were worked hard in my party boxes but VC still seems OK, no scratching etc.