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y two switches so left and right clicks remain similar:

Kailh GM 8.0 — crisp, medium-heavy click; common durable replacement
Kailh GM 4.0 — slightly heavier and more tactile
TTC Gold Dustproof 30M/60M/80M — medium-force, good general replacement
Huano Blue Shell Pink Dot — tactile and relatively firm
Omron D2FC-F-7N (20M) — likely closest to switches commonly found in this generation of Logitech mice, but exact factory parts can vary
Search for, for example:

Kailh GM 8.0 3 pin mouse microswitch