Need a dimension off a 15" Collapsible Spare Tire "Filler"

[R_Builder]

Hi All,

Can somebody get me a couple dimensions off of a 15 inch collapsible spare tire filler/foam piece... like the one shown below? My understanding is that there are 15" and 16" flavors out there and I want to make sure I end up with a 15" (since I am buying used). Not sure when they jumped to 16" on the spare wheels, but I suspect it is an SC/Carrera thing...

For reference, the pic below is the one from my '78 SC that is now sold. I got it half right... remembered to take a pic, just didn't think to measure it!



Thanks for your help!

[R_Builder]

Oops, wrong Forum... I hate when that happens...