Scott. No. No. No. Do not spend $400 for this little
faux pax. I too broke mine off. I tried JBWeld, but it just doesn't stick to the material Porsche has used on this separator.
I bought a pack of inflating needles for a whole dollar (see picture). I cut off the smaller diameter part of the tip. I drilled out the hole in the top of the separator (5/16" is perfect for the threads on the inflating needle.) I put some JB weld around the thread area and pushed the needle into my nice 5/16" hole. I flushed out the separator well, and the repair is done.
Yes, you do have to remove the separator, but once this pieces is broken off you have to remove it whether you do the $400 new part repair, the $200 used part repair or the $1 Lear repair.