The lend lease part is not correct. Lend lease went mostly to UK (Google AI says about 60% of lend lease went to UK & the rest of lend lease was split between USSR & China. Take that with a grain of salt)
Not to be taken with a grant of salt, according to wikipedia: "Most tank units were Soviet-built models but about 7,000 Lend-Lease tanks (plus more than 5,000 British tanks) were used by the Red Army, eight percent of war-time production. " [1]
Also per wikipedia, USSR produced about 30k light tanks, 65k medium tanks (eg: t-34), and 13k heavy tanks. [2]
[0] https://en.wikipedia.org/wiki/World_War_II_casualties#/media...
From: https://en.wikipedia.org/wiki/World_War_II_casualties
[1] https://en.wikipedia.org/wiki/Lend-Lease
[2] https://en.wikipedia.org/wiki/Soviet_combat_vehicle_producti...