Inspirado Seat Pad for Ercol Windsor Dining Chair (Seat-width-451mm, 02-01 Bacardi-Ivory White) - order several if a set is required : Amazon.co.uk: Home & Kitchen
PRE-ORDER Seat Cushions for Ercol Jubilee 766 Armchair - Etsy UK
Ercol Daybed Studio Couch 355 Seat Cushion — Chairs Revived, Bristol Upholstery, Ercol and Vintage Furniture