I scoured the ARP and Dorman catalogs to find a good candidate. The 1988 front hub holes are about 0.490" with the stock studs removed. Dorman recommends a hole size between 0.017" and 0.027" under the knurl OD, while ARP recommends 0.005" for iron and steel hugs and 0.007" for aluminum. It's not clear why there's such a big range or difference between the recommended interference.
The closest longer studs that would fit are ARP 100-7708. These are M12x1.5 studs with an 0.509" knurl, making a 1/2" reamer an easy to find match for making the right hole size. When installed, these studs increase the thread length by 0.84" (21.4mm) over the stock studs.
I pressed the lug studs out of a brand new Rodney Dickman 88 front hub and measured the hole size as about 0.490" at the smallest and around 0.50" at the largest. I went ahead and pressed the ARP studs in without reading the hole to 0.503", and they went in without too much trouble. The hub didn't split, but a few metal shavings were produced by the knurl pushing through the hole.
Since these studs are so much longer than stock, open-ended lug nuts must be used. For GM wheels the stock ones should work. In the aftermarket, I found some inexpensive Gorilla lug nuts on Amazon.com. the part number is 20033SD for a set of 20 lug nuts and the spline drive socket. These nuts are narrow enough to fit in aftermarket wheels. I tried some White Knight lug nuts but they were too large in diameter to fit in the lug but counterbores in my wheels.
