How much will it cost?

[s111Truck_cab]

Hi, I have a 94 V8 3.9ES disco with a Sequential LPG system fitted. It has a non genuine roter arm and dizzy cap fitted and doesnt run too well on LPG. Does anyone know how much a genuine dizzy cap and rotor arm would cost, as I have been advised by a Land Rover specialist garage that this is the problem?

[Newsreader]

Genuine dizzy cap STC8368, £25.42 here (https://www.lrcparts.com/view_product.php?product=STC8368-DISCOVERY&PHPSESSID=1b51b47ad2375179d4c007d375c20578).

Genuine rotor arm STC1857, £20.26 here (https://www.lrcparts.com/view_product.php?product=STC1857-DISCOVERY&searchlink=yes&search=STC1857&page=1&PHPSESSID=1b51b47ad2375179d4c007d375c20578).