I need to replace the inner CV boot on the front left axle of my 2002 E320 4matic wagon. I am considering purchasing an Astoria Flexx FB5000 tool and using Astoria FB3000 universal CV boot. Question - will this boot work for the inner CV joint? The OEM boot for the inner joint looks different - see the one to the right in the first picture below.

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I would just replace the axle - you can buy them from peach parts for like $90 or pick up one from CVJ that is a re manufactured OEM version.

It's not a terrible job; you just need a biiiiig breaker bar on the 27mm axle bolt

I did them on my E430 4MATIC last year and bought them from CVJ.

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE

Universal boots are more for shops / auto parts stores to reduce inventory. Some cars have limited clearance and could cause the boot to rub, not sure about yours. I'd buy the exact boot to reduce the possibility of problems.

Before you remove the boot, please measure the distance between the boots. ( This would be length of the exposed axle. ) I'm working on blending parts for a project and it would be helpful to have this info. Thanks