Suntour was the bike boom upgrade and owned the patent on slant parallelogram RD from 1964 until the early 80s - every RD made today is based on that design.
You should be able to use any shifters with a Cyclone or V.
If your largest rear cog is larger than 28t, you need a GT - Cyclone GT or VGT rear derailleur, but likewise, the shifters should work fine.
If you want to match them, find Suntour shifters of the same era. They have one advantage that their ratchet mechanism keeps the typically stiff derailleur spring from slipping/ghost shifting.

My favorite FD is Shimano 600 EX, and I have my Raleigh set up up with Cyclone GT RD and Shimano 600 EX FD.