49 F1 Front Springs

No experience directly with any of those, but I have heard multiple good things about sdtrucksprings. I believe Eaton makes their 43-134-US, which would be a good thing. You can also buy direct from Eaton, https://www.eatondetroitspring.com/db/es-partsinquiry.php?
Price appears to be very similar. SD offers a cheaper spring, probably foreign-made. I've had the Eatons on my front for almost 15 years, they fit right and no issues. Made in USA. Back then, JCWhitney sold them and they were $100 a pair, shipped for $10!
 
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