There's always this option from Robsport.
TR7 PARTS (SUSPENSION)
Condition: New
Description: Track control arm recon - fitted new ball joint and polyurethane inner bush, bolt & nut - exchange
Part No: TKC878RP/879RP
Price: £37.50
Adam
TR7 V8 DHC Jaguar Solent Blue. 9.35cr Range Rover V8, Holley 390cfm, JWR Dual Port, 214 Cam, Lumention, Tubular Manifolds, Single Pipe Exh, 3.08 Rear, 200lb Spax & PolyBushes, Anti- Dive, Capri Vented Discs & Calipers, Braided Hoses, 4 Speed Rear Cylinders, Uprated Master Cylinder & Servo, AT 5 Spokes and Cruise Lights. No Door Stickers. Mine since July 1986, V8 from 1991