Hi Stephen,
Last week I bought my wiper motor from Stafford Vehicle Components
http://www.s-v-c.co.uk/
I bought it online from their website, they were really prompt and it arrived by post in just 5 days. You can order the drive gear seperately with the sweep angle that you require, I have an RMC which is similar to the G-force and I used a 105 degree. Stafford also supply the wheelboxes and drive parts, their prices are OK, but the postage is expensive.
It is a rotten job to get to the wipers after the dash is installed so I would rather pay for new parts that fit and never have to worry about them again.
Cheers
Ross