The diagram on the Beretta services site shows part no 88 as the "inertia block lever spring" and part no. 94 as the "inertia block spring."
The Beretta parts listing shows spring no. 88 as part no. C53760. It is called the "inertia block lever spring" for 12, 20 gauge. Then the parts list shows part no. C54223 as a 4 gauge spring.
The beretta parts lists lists C54221 and C54222 as inertia block springs (C54221 for 12, 20; C54222 for 4 gauges)
Flip over to Brownells parts list (the US distributor for Beretta parts) and their parts list is different. Brownells shows the C53760 as the only part no. 88. For part 94 Brownells lists part no. C54221, C54222 and C54223 as inertia block springs C54221 = 12, 20 gauge. C54222 for the 28 gauge. It lists the C54223 as .410 (but name it the inertia block lever spring - which is part 88). So I am little confused. The springs physically look a bit different- but they don't picture each part no.
For shooting .410 tubes - which springs do I want for the annual tear down? Do I need 2 of the C54223 springs - one for the inertia block lever (part 88 on the diagram) and one for the inertia block (part no. 94 on the diagram?) OR do I want a new C53760 for part 88 and C54223 for part 94? OR a C54223 for part 88 and C54222 for part 94.