If you're happy with the current highest bid price you can end early via the dropdown menu arrow on the right of the item on your selling list. Click on that and there's an option to sell to the highest bidder at their bid price.
If you want to contact them first click on where it says number of bids on the actual listing and you'll see the list of bidders. Click on the highest bidder's ID and there's a contact link on next page.
You may well get more if you leave the auction running until it ends.
It is usual to only accept cash on collection for vehicles. Although there is no buyer protection on ebay for them you could still risk a chargeback or payment failure at a later date with an online payment. So stick to cash only and buyer will bring it with them when they come to collect.
