As far as I can tell those are the 1-ohm speakers that are meant to couple to the same type of amplifier found in the SESG2 and SESG3. I would hit the tweeters with a multimeter to measure them. Also, there is a good chance that he JL audio woofers won't line up with the mount holes in the grill ( from the pics above). H ave you tried to mount the woofers and the grills together? Any seal issues regarding the grill and the woofer frame?
The 2-ohm 5x7 speakers that came with the saddlebag speaker kit had "non-standard" mount hole spacing and wondering if you will encounter the same thing. What I encountered is that so much material needed to be removed from the mount tabs of the JLs that I got concerned with the ability of the tabs to hold the woofer properly. If I were a betting man I'd lay odds that you will encounter the same thing. If you adjust the JL woofer to where the mount tabs line up, make sire that the top of the JL woofer seals completely against the bottom of the grill assembly (without hitting the woofer surround). If there are gaps it will kill the sound of the woofers.
I agree it would be a tedious procedure to mount the JL tweeter, but it looks like it might be possible. Either way ... I don't think it will be a very easy install even for the JL woofers (but hope I'm wrong). H-D's use of non-standard hole spacing really screws things up.
Dollars to dounts says the woofer driver meant to go with the grill/tweeter assembly you have has the same physical dimensions and mount hole spacing as the one in the attached pic (in case you didn't know, you can click the image for a larger pic). If so, doubtful you'll have an easy install of the JL woofers: