I frame triggers are interchangeable with J frames as Lee indicated above, and there's options to boot:
• Late 1950 - Serrated triggers, already used on I frame targets since 1935, began a transition replacing smooth triggers on all fixed sight I frames until completed ~mid-1951 on I and J frames.
• 1953 I and J .400” grooved target trigger available factory installed likely as early asin 1953, at least by 1956 when 1st observed factory installed in #24363 Pre 35. Followed by .335” grooved and smooth; and in 1986 the .312” smooth combat became standard and all others discontinued.
Mod 34-1 & 30 -1 J frames with wide smooth triggers: