Here's part of the 1978 Master Parts List. It shows that the Studio Lead used the same speaker that was used in the 410SR, 610S, 410S and 610L. Useful if you can find one of those cabinets that has one or more blown drivers.
From August 1, 1978 Master Parts List
Speakers
10" Guitar and P.A. Speakers
81-0300-00-90 10" 8 ohm (Model 2 & 4, Concert Monitor, 1/2 410SR) 19.50
81-0110-08-90 10" 8 ohm (1/2 410SR, 610S, 410S, 610L, Studio Lead) 21.76
81-0116-00-90 10" 16 ohm (Beta 410) (Stage 410) 21.75
12" Guitar and P.A. Speakers
81-0112-08-90 12" 8ohm (412SR,412SRF) 26.60
81-0301-00-80 12" 8ohm (Model 3 & 5) 24.60
81-0126-00-90 12" 8 ohm (A212, 612SR, 612S, 412SP, 412L,
Solos II, Stage 212, Beta 202) 31.25
81-0118-00-90 12" 8 ohm (Beta 212) 35.00
81-0091 12" 16 ohm (1/2 212SR) 24.60
81-0111-16-90 12" 16 ohm (Model 1, 1/2 212SR) 26.60
81-0117-16-90 12" 16 ohm (212LH, 412LH) 35.00
81-0137-00-90 12" 16 ohm (Model 10,12, Alpha Monitor) 26.60
81-0162-00-90 12" 8 ohm ( Alpha 112,112R) 26.60
81-0166-00-90 12" 8 ohm (Alpha 112P, 112PR) 26.60
15" Bass and P.A. Speakers
81-0144-00-90 15" 4 ohm (Beta115, Stage 115, Beta 105-105H) 58.50
81-0145-08-90 15" 8 ohm (Model 8, 215SR, 215BH, 215RH, 115RH,
115BH Coliseum Monitor, Beta 205) 58.50
81-0150-08-90 15" 8 ohm (115SR) 105.30
81-0146-00-90 15" 16 ohm (Model 15, 415M, Magna 2300,
Magna 2301) 58.50
18" Bass Speaker
81-0188-04-90 18' 4 ohm (118M, 118MH, 118RH) 127.50
Keywords: Speaker Price list scn