Fuel Pump Motor Spacing Sleeve O.D. Needed
 

I'm replacing just the fuel pump motor portion of the fuel pump module; however, the fuel pump I was told "is an exact replacement" is not. It does not have the twist top retaining system that the OE one does. I'm left with having to use a foam or rubber sleeve (like in the kit pictured below) to retain it in the fuel pump bore within the module. The problem is I don't know how much space I need to fill between my replacement pump motor and the bore. Does anyone know what size O.D. sleeve to use or have a fuel pump module laying around that can check the I.D. of the fuel pump bore (with the OE retaining system removed)?

CJM Fuel Pump Install Kit, 370z | CJ Motorsports

I already have everything pictured but the pictured sleeve.

Thanks for any help you can lend!