I just replaced my 451's hatch struts for $29 from Amazon. The originals lasted almost a decade. It is so nice not to get bonked on the head now!
https://www.amazon.com/gp/product/B01HFBLRO4/ref=ppx_yo_dt_b_asin_title_o01__o00_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B01HFBLRO4/ref=ppx_yo_dt_b_asin_title_o01__o00_s00?ie=UTF8&psc=1