The early 603's had the square ALDA like the 617's. The big difference is the fitting that the boost sense line attaches to. The 617's used a banjo bolt setup, the 60x used a hose barb for a vacuum line type fitting.

__________________
Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]