https://www.fieldfare.co.uk/bellows-for-knott-kfg35-couplings.html
Bellows for Knott KFG35 couplings - Fieldfare Trailer Centre
Bellows for Knott KFG35 couplings with bolt 75/70/3 folds, widely used on Ifor Williams Trailers (P00873 / Knott 577005)
bellowsknottcouplingsfieldfaretrailer
https://shop.blueline-trailers.co.uk/index.php?route=product/product&manufacturer_id=12&product_id=195
Knott Avonride KFG35 - AC35 Cast Lockable Coupling Hitch Head - SB048/ 575004.
Knott Avonride KFG35 - AC35 Cast Lockable Coupling Hitch Head - SB048/ 575004.
knottavonridecast