RE: TCA side spacers at X-Member
you can with a small amount of work fit the original crush tubes inside the new spacers and use the original bolts.
The crush tubes need to be linished or turned to a slip fit about .005". Either of these jobs very easy with the use of a lathe or can be done by hand but can very time consuming and not that accurate.
If you need me to do set for you let me know.
The larger bolts are used as insurance as there is no longer a bush to absorb any impact.