Suggestions on an Insert for a F-1X? Help!

I just purchased my first Domke bag. I got the F-1X from a marketplace seller on Amazon. Unfortunately, the 720-240 (4-compartment insert) was not included.

I need to purchase a replacement insert for my bag, but I'm having a hard time choosing the correct one. I don't feel obligated to standard insert. I would like to shop around to find one that best fits my shooting style.

Really, I would like to get an insert that would old a 24-70 f/2.8 lens, and maybe a flash on one end of the bag, while a D700 with a 70-200 mounted could be placed in the main compartment.

I'm looking at the 720-220 2 compartment, but the dimensions in the Domke Brochure don't match the dimensions listed on a number of websites.

I would even consider a 700-211 one comparment insert, but I've read that it may or may not be compatible with the F-1X bag.

Bottom line: I'm really confused. Has anyone been down this road? Any suggestions on a good insert for the Little Bit Bigger bag?

Thanks!