Did a brake upgrade on my 240z which included a 280zx master cylinder. The two side bleeders made the air filter cover not fit so we cut the ends off them and it fits now but scrapes still. Can I replace these with 7mm x 1 bolts so the clearance is better or does it require special plugs? Thanks.

Brake bleeders have a special shape and a special material so they seat properly. They are the proper piece for the location. Find another solution...