FYI, I was able to make a removable fire extinguisher mount by having a custom bracket made up and combining it with Rennline off the shelf parts. With the "trunk" empty it fits in nice for storage.
I removed the two nuts that attache the front of the seat bottom to the tub. Slide it on the studs and reattach the nuts. The plate is 1/8" thick so there is plenty of stud height.
FYI, I was able to make a removable fire extinguisher mount by having a custom bracket made up and combining it with Rennline off the shelf parts. With the "trunk" empty it fits in nice for storage.