This detail set from Tamiya is available directly from Lucky Model.com

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Add greater realism to your 1/20 scale Grand Prix model with this Detail-Up parts set. This set is perfect for models depicted from the early 1970's to the early 1980's. Specs & Features - 6-point photo-etched seatbelt buckles included. PE Parts feature "Gateless" design. - Red, blue, and black cloth-like seatbelt stickers included. Four kinds of logo stickers also included.