Brian,
Thanks for the welcome.
The OEM wants $1k+. At Northern Tool and Equipment, it looks like each Category 1 component is in the $20-30 range. It seems to me on the surface that the aftermarket costs are 1/10th that of the OEM. Even if it does not work, it is worth it to me to try it out.
If anyone has an 870 and knows the Standard Lift Arm Spacing, it would be of much help.
Thanks,
paul