# CAS part #'s

**URL:** <https://forums.speedlife.net/t/cas-part-s/212561>\
**Category:** SON240sx Automotive\
**Created:** [May 18, 2011, 7:45pm UTC](https://forums.speedlife.net/t/cas-part-s/212561 "2011-05-18T19:45:24Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Lummer](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/lummer/32/5493_2.png) [@Lummer](https://forums.speedlife.net/u/Lummer)\
**Post date:** [May 18, 2011, 7:45pm UTC](https://forums.speedlife.net/t/cas-part-s/212561/1 "2011-05-18T19:45:24Z")

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ive got a redtop and the CAS in it has 2 #s on it  
D4Y89-01A  
23731 F0501

now ive seen other CAS’s for sale online that say they will work with a redtop but have slightly different part #'s and my brothers redtop has these #s aswell, although his motor runs like a bag of shit… dont ask…

D4Y89-01B  
23731 F0502

my question is what is the difference and is it possible to use either CAS on a redtop?  
they both physically look identical otherwise

thanks for the help

Kyle

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**Author:** ![spd-dmn](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/spd-dmn/32/5513_2.png) [@spd-dmn](https://forums.speedlife.net/u/spd-dmn)\
**Post date:** [May 18, 2011, 9:04pm UTC](https://forums.speedlife.net/t/cas-part-s/212561/2 "2011-05-18T21:04:56Z")

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it’s 50F0# (not F050#)

both the same

good to go

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<div class="post-metadata">

**Author:** ![Lummer](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/lummer/32/5493_2.png) [@Lummer](https://forums.speedlife.net/u/Lummer)\
**Post date:** [May 18, 2011, 9:13pm UTC](https://forums.speedlife.net/t/cas-part-s/212561/3 "2011-05-18T21:13:26Z")

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Yah sorry those #s were memorized. So apparently I’m dislexic lol. Thanks a lot tho. Huge help! Appreciate it a lot

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**Author:** ![Happy240sx](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/happy240sx/32/5515_2.png) [@Happy240sx](https://forums.speedlife.net/u/Happy240sx)\
**Post date:** [May 19, 2011, 3:42am UTC](https://forums.speedlife.net/t/cas-part-s/212561/4 "2011-05-19T03:42:33Z")

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If needed, I have two CAS’s for sale. Both perfect.