Laminated stock bolt lenght?

[plexi]

Hi guys, I have just bought Remington original plywood (laminated) stock for my 870 and seems that the stock bolt length from my wooden stock is not enough. Could you please advise what is the needed length of stock bolt for laminated stock?
Mine is like on the picture below:

[Scorpion8]

Have you held them up side-by-side and compared?

[plexi]

Have you held them up side-by-side and compared?

Stocks are externally the same. The only difference is, i don't know the right term, the depth of the wide part of opening for the bolt itself. The wooden one is two-three inches deeper. I haven't measured my bolt, but seems I have 8-1/2.
The length of narrow part of the bolt opening in plywood stock is 275mm:

[BKinzey]

There are 2 bolt lengths and 10.5" is the other one AFAIK.

[Scorpion8]

There are 2 bolt lengths and 10.5" is the other one AFAIK.

That sounds right to me. Remington's website should offer more of a clue, because I think there were only two options.

[Germansheperd]

There are only 2 bolt options: 8.5” and 10.5”