These all came out of ambulances. I will do a deal to get rid of all of them. Sick of moving them, kickig them in the dark, explaining to visitors what they are etc.
There are 3 types. All swivel.
1- Lets call this one the frame base. Bottom bolt holes are 16" x 16". Top holes are 12 1/4" x 14" and it is 9" from bottom of base to top of top plate. $100
2- Heavy pedestal type with seat belt. Base holes are 9" x 9". Top plate holes are 11" wide by 11" deep on the slides. 19" between the seat belt uprights. 11 3/16" base to top of slides. $100
3- Heavy pedestal without seatbelt and slides (I cut the seat belt mount off and still have it here if you want to weld it back on). Same dimensions as #2 except 10 1/4 high. $75
PM me for photos.