With the Trotskyites completely ousted from power in A Day in July, how have the historical Right Opposition and Left Opposition members and leaders ended up here?
They have been entirely jumbled up here and never even approached anything like those factional divisions. So much of the Right/Left Opposition was about personal loyalty to some member of the Central Committee, and had very little to do with actual hardline ideological divisions so there are plenty of members of both the Left and Right and "mainstream" factions in the Muscovite and Trotskyite camp - however it is worth noting that the Muscovites have a very broad and varied base of support while the Trotskyites here are a much smaller exilic movement, so the weight of numbers is quite uneven in how they are distributed.
However, let me give it a quick shot. Going through wikipedia for a quick list, only have Bukharin, Rykov, Stalin and Tomsky for the Right Opposition though - there would be lower down members who end up as Trotskyites, just don't have their names atm.
Right Opposition Muscovites:
Bukharin (Major Leader of the Governing Clique - Triumvir with Sverdlov and Sokolnikov),
Left Opposition Muscovites:
Alexander Beloborodov (OTL Sverdlov ties keep him in Governing Clique circles),
Nikolay Krestinsky (never fell out of favor ITTL, but also never really at the center of political power as he was IOTL),
Nikolay Muralov (One of the early Muscovites and a core member of the Governing Clique - military to start with but since deeply enmeshed in agricultural affairs sitting on related committees),
Valerian Oboloensky-Osinsky (Commissar for Agriculture, close with Muralov and a hardcore supporter of Sokolnikov - bigger winner in the post-Trotsky reshuffle),
Georgy Oppokov (A leading supporter of Bukharin and a key member of the Governing Clique), Y
evgeni Preobrazhensky (another leading Bukharin supporter and member of the Governing Clique - a big winner in the post-Trotsky shuffle),
Georgy Pyatkov (again a Bukharin man and member of the Governing Clique),
Timofei Sapronov (A member of the Governing Clique, though close with the anarchists, and a hardcore supporter of Sokolnikov),
Ivar Smilga (A protegé of Sverdlov and promoted to Commissar for the Nationalities in the post-Trotsky shuffle), I
van Smirnov (initially a supporter of Zinoviev, he later joined the Muscovites and rose to the Commissariat for Communications in the post-Trotsky shuffle)
Vladimir Smirnov (a youth friend of Bukharin and Osinksy, longtime supporter of Bukharin and a prominent figure in the Governing Clique).
Right Opposition Trotskyites:
Left Opposition Trotskyites:
Adolphe Joffe (died in 1927, but his family escaped with the Trotskyites following Trotsky's fall from power),
Karl Radek (leading Trotskyite figure and a key figure in the attempted Trotskyite coup - killed in the resultant fighting),
Lev Sosnovsky (Fought in the east under Trotsky and later became one of his leading propaganda writers, fled into exile following the failed Trotskyite coup).
Civil Society/Non-Political/Military:
Mikhail Tomsky (trade union leader but not part of the Soviet government), Sergei Mrachkovsky (remains involved in the military, initially with Yekaterinburg, but a Soviet Loyalist in the 1930s),
Christian Rakovsky (While friends with Trotsky, he ended up in Moscow during the RCW and rose to a prominent position in their foreign service, uninvolved in Trotsky's rise or fall),
Victor Serge (although aligned with the Anarchist Clique, he ended up as a prominent writer and journalist instead of being enmeshed in politics)
Dead:
Alexei Rykov (killed by Trotsky),
Stalin (POD),
Mikhail Boguslavsky (Killed in the Ukraine),
Andrei Bubnov (formerly Muscovite CC member, ousted from the CC, enlisted as a private and KIA during the RCW),
Yakov Drobnis (killed by Whites in Ukraine),
Other:
Chen Duxiu (part of the Shanghai Communists)
I am sure more could be found, but these were the ones on the lists on wikipedia. Hope this answers your question at least somewhat.