So I received the Nelson-Rigg SPRT-50 bags and they will be plenty big enough for my needs. I only plan to use the saddle bags a few times a year...the tail bag gets me to work and back, and I commute on a KLR650 in the winter.
Paid $65 on ebay and also got the rain covers for $10.50
There are several ways to mount these bags...they have two heavy duty straps to go over the bike, and four straps to hold the bag down...two per side.
I read on some other threads that going under the seat puts stress on the plastics. So, I went over and added a simple support system. The bracket is a piece of aluminum found at home stores, bent to fit the width of the bags when installed, in my case, 16 1/4"
The stock reflector screws (M5 x 0.8 thread) accept a readily available cap screw or bolt from the home store. The width is about 14 1/14" so I bought some UHMW sleeves..again, at the home store. Total = $ 8 for everything. Paint I had. Fastened up under the tail area to some bolts up there.
I needed a system to come-and-go...install takes maybe 5/10 minutes.
Pics of set up:
bracket and spacers during fit up ...before paint