need help with a rare 50w zener

[El-even]

Hi guys,

i'm searching for 1n4558 (4.3v 50w zener) for my beta lead preamp but cannot find one of them anywhere
the only equivalent i found is the 1n5336 (4.3v 5w)

noob question,
is the wattage difference a big issue for this building?
powering with +15v/-15v

http://postimg.org/image/uxexs16rj/full/
(image from this thread http://freestompboxes.org/viewtopic.php?f=2&t=25813)

[El-even]

oops...
my bad
i need 1N458A instead of 1N4558

is there a big difference between glass or hard diode enclosures?

[kirshman]

I don't think there's a big difference between the glass or plastic casings, but maybe someone who knows more than me can chime in.  mouser.com sells 1N458A for $.17 each, and theirs are in the plastic.

http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/1N458A/?qs=sGAEpiMZZMudZehw8RjeZeaTZWtiywtx

[El-even]

Thanks for the link kirshman