The EZ-Start units could be problematic at times on the glow plug circuit, if you have a glow ignitor, try that on the plug then swap the plug if it doesn't start. You can also fit the entire Electric Stampede suspension, minus the rear tower to it to widen the trucks as well as all but the same Proline wide track kit parts for the Slash 2wd to it as well.

Here's an old build I was working on 13 years ago that was stolen before completion.

02-07-2005102059PM by bjoehandley, on Flickr

I had the full electric suspension with Big Bores and Trinity Light Blue heavy springs in the back and RPM Carriers and Caster Blocks.....minus the rear tower (that's Nitro Pede/Rustler/Sport specific and not swapable), New Era front bulkhead, Trinity Hinge Pin Brace, 2.5R with Revo pipe, 2.5/3.3 Maxx header and Nitro Rustler/4-Tec gas tank, MIP Maxx/Revo engine clutch and Robinson Racing E-Maxx metal slipper and spur gear, HiTec 645 (steering) and maybe 625 (throttle) servos, Dynamite (I think) antenna mount, and I think Lunsford Ti camber and toe links.