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I think you simply go for the minimum offset.
Eg I have 6.5j rims with a 43ET, but a 20mm spacer on the front, which brings the ET down to 23mm.
If you have 8" rims that will be about 3/4 inch wider (20mm) each side than yr existing 6" rims. I would not go wider or less offset as it may look good but you may get bump steer and there may be clearance probs ob full lock.
I think you simply go for the minimum offset.
Eg I have 6.5j rims with a 43ET, but a 20mm spacer on the front, which brings the ET down to 23mm.
If you have 8" rims that will be about an inch wider each side than yr existing 6" rims. I would not go wider or less offset as it may look good but you may get bump steer and there may be clearance probs ob full lock.
Sorry, I was just looking at wheels on ebay.......
Nick is right about the front, I would go with the 15x7 ET20. The rear needs to be the 15x8, 4x100 PCD, ET5 with a 25 mm spacer. But I will double check for you, before you go ahead and order anything.
Been keeping myself busy in the garage while I wait to go and see Chris on the 23rd to sort out the kit. Decided to strip down the rear suspension, deal with any worn parts, Brake disc's Pads etc . Glad I did in the end as the rear hub to wishbone bolt was bent and now awaiting new coilovers and discs & Pads. So now coating the suspension arms and decided to treat any surface rust and cold galvanize everything, followed by a good dosage of underseal. Result below
Hope the kettle is going to be at the ready , looking forward to meeting up to chat about all the stuff i am out of practice at... i.e. working with GRP.
By the way have you got any pic's of how the rear section attaches to the tub, especially by the doors?
Sorry Nev I have fallen behind on the Build Manual but take a look at the "Convertible MX250" and "New Version of MX250 based of Mk2 MX5 " treads whilst I catch up!
The car is on drive on ramps that can be elavated once the car is on.
Here
At the moment have refitted the Bilsteins and standard springs, but ordering some coil overs to give the option of altering the ride height for the flexability once i have the new wheels and the body on.
I prefer the original Gulf light blue. But If you get it to look like that picture you will have to give yourself more time to go anywhere as it'll stop the traffic.
Snipped up for a 100 notes, wondered if they would look too hot rod if powder coated in anthralite. Might suit Chis's pick up though...... mind you adaptors will cost 3 time what the wheels did.....
. Glad I did in the end as the rear hub to wishbone bolt was bent and now awaiting new coilovers and discs & Pads. So now coating the suspension arms and decided to treat any surface rust and cold galvanize everything, followed by a good dosage of underseal. Result below
, looking forward to meeting up to chat about all the stuff i am out of practice at... i.e. working with GRP.
but take a look at the "Convertible MX250" and "New Version of MX250 based of Mk2 MX5 " treads whilst I catch up! 
, wonder how much for shipping? 
