My wife and I are expecting our first in a few weeks. I would like to know what is necessary for me to do to retrofit a LATCH anchoring system (top strap anchor and/or side anchors) into a 1991 E300 (W124). I've done some research and there is apparently a nut already welded for the top anchor, but I must locate some form of bolt extension kit. Does PeachParts carry this item?

Thanks