Cot Mattress, incorrect size

Cot Mattress, unfortunately to big for my granddaughter cot, I should have taken my tape measure before buying Length 130 cm or 1300mm Wide 70 cm or 700mm Is second hand but in very good condition, Would do a straight swap if that works for someone as long as the mattress is an innersprung mattress in good condition. My measurement are 120cm long by 60cm wide. Pickup Taupo