Snell eIII new woofers needed

the surrounds on my 12 year old snell eIII's are starting to come apart. The low freq driver is a Vifa (M21WN-07 4ohm). Seems to be discontinued. Before I call Snell re a replacement kit (very successful on my 16 yr old K's!), anyone with experience with other avenues? Redesigns?

Thanks in advance