Spanner for 115mm Angle Grinder (Iver Heath Fields SL0)

This is for changing the grinding disk on an angle grinder. I bought this without looking carefully at the size of my angle grinder and it doesn't fit - it's not worth returning as the return postage is about 20p less that the cost of the item! Dimensions are 30mm across the 'pins' centre to centre. If you would like it, please let me know - it's of no use to me! We are in Iver Heath