Alternator

Howdy

I have a (I thought) simple question. I need to upgrade the alternator on a Subaru Legacy 2.2 A/T, A/C 1990 from the OEM 70 Amps alternator to a high power unit.

I found this one, 135 amps:
http://www.maniacelectricmotors.com/hiou135ampal.html
$268.00 plus shipping.

Then accidentally I did find another:
http://auto.sears.com/Subaru-Legacy-BOSCH-ALTERNATORS/Product.htm?catalogId=10623&productId=2018615&N=200743416+1995
$172.99 plus shipping
However, Sears, 1- does not indicate the amps rating and 2- does NOT list a Legacy older than 1995.

Therefore my question is:
Will a 1995 Legacy alternator **fit** on a 1990 Legacy.

Thanks