1930 Phaeton floor parts question.

[Firedome]

I need to replace the rear seat base and floors in a 30 Standard Phaeton (35B) but all I see in the Macs/Snyders/Mike's catalogs are for the 28/29 model....

So is this the same on the 30/31 models?

If there is a difference, can someone point it out or is this something I can modify these parts fairly easily to fit (via cut & weld)?

Thanks in advance!

-Clif