I'd go with the WGRS for a LH rifle. Nothing wrong with it for a RH either. They're also much less expensive than the Lyman, just not as refined or with the same ease of adjustments.
Ellwood Epps has them in stock for $50 for a 700 as well as other models.
https://ellwoodepps.com/williams-wgrs-receiver-peep-sight-wgrs-700-remington-700-721-722.html