Stone Lintel 90cm + (Saltdean BN2)

Looking for a natural stone (not concrete) lintel . Will make a donation to The Rainforest Trust. It needs to be at least 90cm (3') long or 1m, probably 100 x 150 mm (6x4") or 100 x 200 (8x4) cross section or similar. Most likely sandstone. maybe you can send a photo ? Thanks Richard