Don't remember the 51-4 seat construction very well but if your car (or anyone else contemplating belts) has the type seat with a bottom cushion that drops or even bolts into a metal full seat frame that surrounds both cushions you may also want to consider slotting the frame to get a more or less straight pull to the anchor points. If this is done it could also affect the length of belt needed.
If you try to come up from an open bottom into the frame then you would require a path to work around the cushion. There could be a sharp edge the belt would rub over plus a bend or two. If the cushion or frame dislodged in an accident the belt could be cut or, because of the bends, if the belt goes slack it could be of little use.
Most pre 51 models had this type seat construction. Here are a couple of photos showing a straight belt path and the added slots in the metal frame to allow it. First one Mike took of his 47 shows the finished belts and the slots and bare frame are of my 47.
Attach file:
DSC_8555 copy.jpg (112.69 KB) IMG_2173.jpg (109.73 KB) 209_554b898af15a6.jpg (88.33 KB)
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=253689