boats

my other half has a plymount pilot 16 and wants to fit the fish finder to it for this years mackerel fishing(the dogs love it)and has no sounder paper its a furuno,and he needs 4 inch paper only bout 4 rolls and iv trawled the net and cant find any do any one have any idea of to were id get some,also hes after a skate net,any ideas thankyou all for looking.