I need to change the outer primary cover on a 2006 Softail? It has the small 4 bolt cover in the center. Can I use a later model cover without the 4 bolt cover, Or do I need to stay with the 06 and eariler cover. Thanks

 

That 4 bolt cover you're referring to is the primary chain inspection cover. I thought 2006 they went to self adjusters but if that's not the case and it's still a mechanical adjustment you should replace it with the same unless you want to pull it every time you check/adjust the primary chain.
Edit: In 2006, Harley-Davidson engineers designed a primary chain auto-adjuster. This auto-adjuster was installed that year on Dyna’s, and starting in 2007 on the rest of the v-twin fleet. That means you are blessed in having a mechanical adjustment for the primary chain. Find a cover that matches it or you'll have to pull the entire cover to address it.

 

If the outer primary gasket has a different part number ('06 vs '07) then the hole pattern probably has been changed.

 

Thanks I will look for a replacement cover with the adjustment plate.