If you want to retain your current gypsy
(chain wheel), you must use chain that is essentially identical to what is now in use. Maxwell gypsy
design does not tolerate much change in link size, so they have a wide selection of gypsies for each windlass
So, in your case, I would suggest either replacing with identical chain or planning on taking a short bit of your new chain to a Maxwell
dealer and letting him sell you a new gypsy to fit it.
And it is normal to use some form of short link chain with any windlass