Ram-Lin Trailer Wheel Gurus.

[Bevan]

Hope some one here can help? I'm trying to find out if some after market wheels will fit my 08 Ram-Lin Trailer. I've emailed the specs to Ram-Lin but they won't return my messages, if they're still in business then I'm not very impressed with their customer service :o Here are the specs and a couple pics of the trailer and wheels...thanks!
SIZE: 18 x 7.5, OFFSET: + 45, 5 STUD PCD: 5 x 114.3