63 Front seat tension spring

Hello again. I am getting down to some of the smaller final details on this build, so here I am again with a request for info. I need a picture or measurements for the return/tension spring for adjustment on the front bench seat as mine are missing. I think there are 2, one for each side. These are the springs that have tension on them when adjusting the seat forward and backward. I have checked most of the usual vendors and can't seem to find anything and can't find any info on them. I will probably have to buy a universal fit spring but I need a starting point. Thanks to all again for any info and help.