TH350 tranny kickdown cable seal

[mikefam]

I converted my 68 Camaro to a 3 speed TH350 transmission and am having trouble finding a seal for where the detent/kickdown cable enters the transmission body.  I have read that there is a tophat shaped seal that will work but I can't find it online and the seal that NAPA came up with was too large.  The seal that I need will have a 5/16" inside diameter to fit the cable housing.

TIA, Mike.

[mikefam]

OK I identified the seal that I need but am having trouble finding one locally now.  Here's a link for anyone that is interested

http://www.kakapart.com/parts/gm-1262475.html

Mike.

[mikefam]

Correction from my first post - the inside diameter of the seal is 3/8" and not 5/16".