Correct Gas Tank Repro - '40 Series 60 Century/Series 40 Special

[allcars]

Have any of you obtained a reproduction fuel tank for your 1940 Buick Series 40 Special or Series 60 Century? There are three styles offered, with the fuel filler placement varying a bit on each. My '40 Century is in winter storage, so I can't measure it just now. Please see the attachment for the critical measurement and the variation for each tank style. I need to determine which one to order. I assume the other two styles fit 1) Series 50/70 Super/Roadmaster and 2) Series 80/90 Limited.

Thanks!