Loads of Rover and Ford part numbers for this, MJC100021, JZX3491, findpart.org
lists loads of analogues. According to this page
it's 4kOhm +/- 20%, I measured 200Ohm to 3.8kOhm over the ~125 degree sweep. It uses the standard 8mm diameter D-shaped spindle. The ~4.2mm diameter mounting holes measure 32mm c/c (fits the Volvo B230 throttle body better than the original throttle switch does) and they're surrounded by thick enough plastic that they could be cut into arcs to allow for adjustment (not necessary on B230).