HOUSINGS Ted, not the neck, the ENTIRE waterpump housings (which includes the waterpump along with the neck) ARE interchangeable. Reading comp.......
The only potential difference between two n/a waterpump HOUSINGS might be the therm sensor threads are different and a coolant hose might be in a slightly different location. Both of which are easy fixes.
On my RE, I fit an S4,5, and S6 waterpump housings. S6 needs longer studs and S6 e-shaft pulley to work though.
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