the nose wheels (main landing gear from B 24) and undercarriage were taken from a crashed B-24. The Junkers 287 was a testbed for the development of multi-engine jet bombers. It had a forward-swept wing (unique for the time) but also a fixed landing gear. Only 1 was operational and another one nearly completed before the end of the war.

https://www.facebook.com/photo/?fbid=859461549928022&set=a.187788823761968

assembled from the fuselages of the He 177 A-3, the tail of the Ju 188G-2, main undercarriage and nosewheels taken from shot-down B-24 Liberators, all of which were fixed to lower weight and complexity, and equipped with spats to reduce drag.

the Soviets captured the engineers who worked on the Ju 287 (though not before both prototypes were destroyed by the Germans to prevent their capture), and employed them to build their own forward-swept wing bomber prototypes, the OKB-1 EF-131 and EF-140

https://www.reddit.com/r/WWIIplanes/comments/wlmz5k/junkers_ju_287_circa_late_1944_the_ju_287_was_a/

https://en.wikipedia.org/wiki/Junkers_Ju_287