Hi.

I don't understand the issue with the blinkers, unless you want them to work along with the exixting ones...
...or do you simply want to replace the ones you have with a new set?

In the latter case, just unbold the old, unplug the wires and plug in the new cables, bolt on the blinkers and you're done!

As for the bar end mirrors, if the bolts are too long measure how much too long they are, and buy two new bolts which will use the same nut, and are shorter by the amount you need.

Shouldn't be a big deal !  

Your bar end mirrors are going to be a problem if the bars have the metal weight welded inside.  There is very little room to install the mounts for the bar end mirrors in the stock handlebars.  You can try a shorter bolt....no gaurantees.

The turns signals are held in by screws on the side of the mounts that thread into the turn signal stalks.  Most replacement turns signals do not mount this way....so you are going to change things to make the replacment turn signal work.  The stock rear signals are single element and only work as turn signals, the stock front turn signals also have running lights in them.....so you may end up not connecting the brown wire if you don't have running lights in your turn signals.....the turn signal wires are mint green and black I believe.

The new generic turn signals probably have a threaded stem with a nut on the end.  You may have to ream out the existing mounting holes in your bike to get them to fit in.  You'll have to take out the old ones before you will know for certain.  You can secure the new signals with the nut that is provided or maybe you could jam the Savage's set screw into the side of the threads and it would hold.  Won't know until you get into it.

Your new generic turn signals may have 2 or 3 wires.  One wire for the blinking (probably red), one wire for the ground (probably green) and possibly a third wire for a running light of some other color.  As Dave already mentioned the rear set on the Savage is blinking only and only two wires are provided, the blinker and the ground.  The front bulb and socket also has a filament that is used as a running light.  So for that connection the Savage has three wires.  If your new signals don't have three wires just hook up the one for the blinker and the ground.

Which one is the blinker?  In a three wire setup with a dual filament bulb the brightest one is the one you should use for blinking so people can see it in the day light.  The running light filament is dimmer because it only needs to be seen at night.

Test your new turn signals before you start.  Hold the wires to a 12 volt battery.  Car batteries are easy to reach.  Ground to negative and then touch the other lead to positive to test.  The rear wires on the Savage turn signals are (I think) black and black with white on the left side.  On the right side I believe it is green and black with white.  The green wire (if that is what you have) should connect to the black and white wire.  Hope this helps.  If not, post again and tell us how many leads, 2 or 3 and anything else that you have.