Welcome to the Strelets Forum. Please feel free to discuss any aspect of 1/72 scale plastic figures, not simply Strelets. If you have any questions about our products then we will answer them here.
After recommending the Italeri Bridge, I checked MichTSCo and discovered theirs is a "two-arch" bridge, with the same kit number as the newer "one-arch" bridge, and there was no 3-arch bridge (sorry).
If you buy one, you should e-mail the seller and ask them to explain the contents of the kit. Like I said, both bridges have the same kit number, but different pictures.