Need advice for new rear leafs, stock height to match 1.03 bars.

No. The oval track springs have a LONGER front section. By a 1/2”. The special hanger is shorter, not the spring. Just look at the link for the special AR hangers, which says the hangers are shorter by a 1/2”.

your response got me thinking so i went out and dug them out to measure them.
You are absolutely correct.The front section is 20 1/2"...1/2" longer than stock, PN #4529414, 5 leaf mopar oval track springs.zero arch,120lb. per inch
..thanks!