From a bit of research several years ago, it looks like the following should interchange:
Turn signal flasher: Signal-Stat 144, Tung-Sol 224
Emergency 4-way flasher: Tung-Sol 552, Signal-Stat 175
That's for standard (non-RS) lights, so the turn signal flasher type may differ for RS due to load sensitivity (number of bulbs). LED bulbs require an LED-specific flasher.
Not much info available out there about these, but surprised a 552 didn't work?
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