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1G ECU capacitor replacements

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I had a question also. I recently went to Electronic Supply Co. here in Kansas City and purchased these capacitors per VFAQ:

47 µF @ 50V
22 µF @ 50V
100 µF @ 25V

Now, I want to replace these as a precautionary measure as my ECU is in pristine condition and want to keep it that way. When I socketed my ECU I was going to replace these as well but I held back since the ones I bought have a smaller physical size than the ones that are in the ECU currently.

Question: Does the capacitor's physical size matter? Or should it be based souly on the rating?

Thanks
 
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